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The relationship between sleep habits, anxiety, and depression in the elderly

Authors Leblanc M, Desjardins S, Desgagné A

Received 5 November 2014

Accepted for publication 1 December 2014

Published 5 February 2015 Volume 2015:7 Pages 33—42


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 4

Editor who approved publication: Professor Steven A Shea

Marie-France Leblanc,1 Sophie Desjardins,1 Alain Desgagné2

1Department of Psychology, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada; 2Department of Mathematics, Université du Québec à Montréal, Montréal, QC, Canada

Purpose: The objective of this study is to determine which sleep-related behaviors are most often used by the elderly according to the presence or absence of anxiety and mood disorders. In particular, we are attempting to determine whether these behaviors are associated with the probability of suffering from a mental disorder. The behaviors being examined in the present study are taking naps, television watching or reading at bedtime, physical exercise at bedtime, relaxing activities at bedtime, and caffeine consumption in the evening.
Methods: The sample in this study consists of 2,759 participants aged 65 and over, with a mean age of 73.8. They were recruited through a method of random generation of telephone numbers according to a sampling strategy based on geographic location. After the goal of the study was explained to them, the participants agreed to have health professionals visit their home and to answer questions in an hour-and-a-half-long structured interview (after signing a consent form).
Results: Taking naps is the activity most often practiced by the elderly. Watching television and reading at bedtime are also frequent practices among them. The probabilities of suffering from anxiety are greater if the person never or rarely consumes caffeine after 6 pm, if the individual takes naps during the day, or if the person practices relaxation before bedtime. Television watching, reading, and physical exercise before bedtime are activities that are not associated with the probability of suffering from a mental disorder.
Conclusion: It would be beneficial for research to be conducted to support the findings on behavioral differences between depressive and anxious seniors so that these behaviors can become further indicators of the presence of mental disorders.

Keywords: bedtime, nap, relaxation, physical exercise, caffeine, mental health


Many elderly people say that they sleep poorly; at least half of the seniors questioned in the USA report sleep problems,1,2 as do a similar proportion in Québec, Canada.3 The percentages recorded in Brazil are somewhat lower.4 Significant levels of anxiety and mood disorders are also found in this same age group. In Canada, the lifetime prevalence of these disorders for seniors is 10.3%.5 In France, approximately one older person in ten reported having one of these two types of disorders within the past month.6

Among the factors that maintain sleep difficulties are sleep-related behaviors, which have also been shown to have some associations with older individuals’ mental states.7 Some of the behaviors known to affect sleep are taking naps, reading or watching television at bedtime, relaxation, coffee drinking, and physical exercise in the evening.

Naps can thus have an impact on sleep. Taking naps becomes a popular practice as people grow older.712 Between the ages of 65 and 89, the levels of nap taking increase from 15% to 50%, and these levels differ significantly in individuals under 65 years of age.7,9 The number of naps also increases with age, from one nap a day to more than four on average.10,12,13 The duration of the naps becomes up to 2.5 times longer as well.9,10 Older men take more naps than older women,14 with only 10.8% of the latter taking a daily nap.15 Seniors who complain about their sleep take more frequent naps.1519 Naps, especially when they are too long and are taken in the late afternoon, affect sleep, which then becomes shorter and of poor quality; naps also increase sleep-onset latency and awakenings.15,17,1921 But the practice of taking naps does not allow us to systematically distinguish good sleepers from poor sleepers.14,22 For the elderly, taking short naps or naps together with moderate physical exercise early in the evening is associated with good quality sleep.2325 Other researchers have also shown naps to have relatively little effect on sleep.14,22 Very surprisingly, not taking naps seems to be a protective factor for survival over a period of 7 years.11 Some studies have found links between naps and mental disorders,7 and particularly links to obsessive–compulsive disorder26 and depression15,27,28 in the elderly.

The second behavior that is frequently observed in this population is reading or watching television before going to bed. This is a common practice in older seniors,2932 and the time spent watching television increases with age, to the point of doubling.31 News and sports programs are seniors’ favorite television choices, followed by documentaries.31 Elderly people’s beliefs have been found to be mediating variables enabling researchers to link depression and television watching33 and, more specifically, a high number of hours in front of the television and depression in older men.34 Moreover, the time spent in front of the television is negatively correlated with life satisfaction, with those who watch a great deal of television having a significantly lower level of satisfaction than those who watch television less often.34

The third behavior that can affect sleep is less popular with seniors; it is physical exercise at bedtime. The levels of practice of this activity generally diminish with age. Up to two-thirds of older persons over 75 years of age are physically inactive, but men are more active than women.35,36 Active older individuals awaken less often at night than more sedentary seniors and report longer and better quality sleep.37 Daytime physical exercise in fact tends to trigger neurochemical changes that positively influence wake–sleep cycles and the quality, quantity, and efficiency of sleep, while reducing awake time at night and daytime sleepiness.20,23,24,3841 Physically active older people also take fewer naps,37 and the fact of practicing a physical activity seems to be a protective factor in terms of life expectancy according to a measurement performed over a 7-year period.11 Moreover, not doing physical exercise is associated with sleep problems.2325,27,40,4244 The fact of seniors giving up physical activity is sometimes linked to their fear of compromising what they see as their rather precarious sleep, so that they engage in avoidance behaviors that may seem to be in accordance with their age. Canceling social, family, or work obligations, especially after having a bad night, and staying indoors all day may maintain or even increase insomia.40 The habit of exercising before bedtime, which has been observed in less than a third of the elderly,18,30 can be considered as being detrimental to sleep, especially when these physical activities are too intense.16,20,24,38 These activities lead to increased sleep-onset latency and a state of excitation that is not conducive to sleep.20,24,38,45 Daytime physical exercise can result in a lessening of psychiatric symptoms,40,41,46 and, more specifically, in a diminished depressive41,4750 and anxious48 symptomatology. A low level of daytime physical exercise has been associated with anxious40 and depressive35 symptoms. Physical exercise before bedtime has been found to be linked to a greater probability of depression in raw (unadjusted) data.30

Relaxing activities at bedtime are a sleep-related behavior. They are practiced often by more than half of elderly people,40 who use them when they find it hard to fall asleep.16,18 These activities include taking a relaxing bath, listening to relaxation music or practicing gradual muscular relaxation, meditation, yoga, guided imagery, or controlled breathing.30,41 Relaxation increases sleep quality and satisfaction and decreases sleep-onset latency, nighttime awakening and daytime sleepiness.16,20,40,51,52 Relaxation before bedtime (taking a bath) was found to be linked to a greater probability of depression.30 However, relaxing activities before bedtime were also often associated with a decrease in depression and anxiety.48,53,54

The last sleep-related behavior is caffeine consumption in the evening. This habit decreases with age.19,27,55,56 Individuals over 65 years of age consume caffeine in the form of coffee, tea, and soft drinks.57 Older people experience a stronger physiological response to caffeine,58 especially when the doses are high.59,60 Caffeine consumption can negatively affect seniors’ sleep efficiency and the duration of their sleep.16,27,28,40,61

The most frequent behaviors in elders struggling with insomnia are television watching, reading, taking a nap the day after a poor night’s sleep, or drinking alcohol. These actions may further impair sleep.18 More women than men read to induce sleep, and the number of approaches used is proportional to the number of sleep problems.12,18 Several sleep-related behaviors have thus been studied in elderly clienteles. However, in many of these studies, the size of the sample is small, and none of the studies have examined all of the behaviors discussed in the introduction, which prevents us from measuring the actual specific link of the predictors to the mental disorders. Similarly, some of the associations that have been found between sleep-related behaviors and one or both types of mental disorders have only been observed once. This may be interesting, and it would seem relevant to try to reproduce the results, especially with a large sample. Finally, some behaviors have never been verified in terms of their direct relationship to these two types of mental disorders (television watching or reading at bedtime, for example).

The objective of this study is to determine which sleep-related behaviors are most often used by the elderly according to the presence or absence of anxiety and mood disorders. In particular, we are attempting to determine whether these behaviors are associated with the probability of suffering from a mental disorder. The behaviors being examined in the present study are thus taking naps, television watching or reading at bedtime, physical exercise at bedtime, relaxing activities at bedtime, and caffeine consumption in the evening.



Data for this cross-sectional study were obtained from the longitudinal Quebec Survey on Seniors’ Health (Enquête sur la santé des aînés) conducted during 2005–2008.62 The aim of the survey was to assess the physical and mental health of a French-speaking community-dwelling population aged over 65 in the province of Québec, Canada. The sample in this study consists of 2,759 participants aged 65 and over, with an average age of 73.8, who live in various administrative regions of Québec. They were recruited through a method of random generation of telephone numbers according to a sampling strategy based on geographic location. After the goal of the study was explained to them, the participants agreed to have health professionals visit their home and to answer the health professional’s questions in an hour-and-a-half-long structured interview (after signing a consent form). The health professionals had been given two days of training on the computerized questionnaire. The questions that the participants were asked regarding DSM-IV-TR criteria were similar to those in the Diagnostic Interview Schedule, which has a good degree of validity and reliability.63 The questionnaire that was used was also adapted for older persons.64,65 Sleep-related behaviors were also examined. Participants received a financial compensation of $30. Some participants were excluded: that is, seniors with a score of less than 22 on the Mini-Mental State Examination.66 Nearly 54% of the participants reported having no spouse, and almost 65% had a secondary (or lower) level of schooling. Close to half of the participants reported having an annual income of under $25,000. Finally, sleep efficiency (calculated by dividing the time spent sleeping by the total time spent in bed, multiplied by 100) was over 80% in nearly three-quarters of the elders selected for this study. Sleep efficiency was measured by noting, among other things, the number and duration of awakenings, the time taken to fall asleep, the participant’s bedtime, etc.


The variables under study are connected with sleep-related behaviors, including taking a nap during the day, relaxation, television watching or reading, physical exercise – all before bedtime – and the use of caffeine after 6 pm. The participants answered the following questions: “In the past month, did you take a nap during the day?”; Before bedtime, do you “regularly practice relaxation activities (taking baths, etc)?”; “watch television or read in your bedroom?”; “do physical exercise in the two hours before going to bed?”; “drink beverages containing caffeine, after 6 pm?”. The possible answers were Never, Rarely, Sometimes, Often, and Very often. These answers were divided into two categories: that is, Never or Rarely, and Sometimes to Very often. The covariables under study are sex, age (aged 75 and over, or aged 65–75), marital state (the person reports living alone or living as a couple), income (annual income over or under $25,000), and schooling (postsecondary level or below). Sleep efficiency was also a covariable under study: the ratio of the time spent sleeping to the time spent in bed evaluated at over 80%. In terms of anxiety and mood disorders, the participants were divided into three groups according to DSM-IV-TR diagnostic criteria for the disorders studied. Participants meeting the diagnostic criteria for an obsessive–compulsive disorder, a generalized anxiety disorder, a panic disorder, or a specific or social phobia were placed in the group of anxious individuals (n=103); participants presenting a major depression, a minor depression, or a mania were put in the group of depressive persons (n=161); and the group of asymptomatic individuals (n=2,495) consisted of participants not exhibiting a mood or anxiety disorder.

Statistical analysis

In order to evaluate the presence of differences between the three groups formed based on the diagnosis of an anxiety disorder, a mood disorder, or no mental disorder, chi-squared tests were performed. These tests were conducted using PASW Statistics 18.0, with a threshold of significance set at P<0.05, and they included all the variables and covariables in order to obtain an overall profile of the groups under study. All the variables and covariables were used in a multinomial logistic regression analysis, and a fully adjusted model was employed. This analysis was used to assess the risk of the person presenting an anxiety or mood disorder according to the presence of one or another of the sleep-related behaviors, because it verifies the specific relationship of these predictor variables and the significant associations of each with the mental disorders under study.


Naps are taken sometimes, often, or very often by 56.9% of the seniors in our sample. Watching television or reading before bedtime is also frequent in older individuals, with 53.0% of them practicing such activities sometimes, often, or very often. The levels for relaxation, caffeine consumption, and physical exercise before bedtime are 26.1%, 20.3%, and 10.7%, respectively. Table 1 presents the descriptive statistics according to the presence or absence of an anxiety or mood disorder. We find higher levels of the practicing of relaxation before bedtime for individuals dealing with depression or anxiety than for those not suffering from any disorder. Anxious persons exhibit the highest levels of practice of relaxation techniques. Only a quarter of asymptomatic older people practice this activity, whereas more than a third of anxious and depressive seniors habitually do so. Compared with asymptomatic older individuals, depressive or anxious elders do not show any significant difference in terms of television watching, reading, and physical exercise before bedtime. Taking naps is popular with anxious persons, two-thirds of whom do so. We find that women and younger seniors (under 75 years of age) are overrepresented in the depressive and anxious groups, compared with the group of those not suffering from any mental disorder. Sleep efficiency is more often under 80% for depressive and anxious older persons than for asymptomatic elders.

Table 1 Descriptive statistics for the sociodemographic variables according to the presence or absence of an anxiety or mood disorder
Note: *P<0.05; **P<0.01.

The results of the regression analysis (Table 2) show that the probabilities of suffering from anxiety are greater if the person never or rarely consumes caffeine after 6 pm, if the individual takes naps during the day, or if the person practices relaxation before bedtime. Compared with asymptomatic individuals, television watching, reading, and physical exercise before bedtime are activities that are not associated with the probability of suffering from a mental disorder. The specific effect of each variable is taken into account only once, despite the fact that both anxiety and mood disorders show higher levels for the practicing of relaxation, only the risk of anxiety is associated with this practice. The practice of relaxation thus clearly shares a common variance with other variables, and once we have controlled for this effect, the direct link with mood disorders is no longer visible. To conclude, in terms of classification, we obtained a percentage of accuracy of 90.6%. Nor was any multicollinearity detected, according to the statistical tolerance levels obtained, which were higher than 0.20.

Table 2 Odds ratios (OR) and confidence intervals (CI) for sleep-related behaviors predicting the presence or absence of an anxiety or mood disorder
Notes: aReference group. R2=0.031 (Cox and Snell), 0.059 (Nagelkerke). Model χ2(22)=78.20, P<0.001. *P<0.05, **P<0.01.


The first part of the objective targeted by this study was to identify the sleep-related behaviors performed by the elderly according to the presence or absence of an anxiety or mood disorder. When we examine each of these behaviors, we find that taking naps is the activity most often practiced. Naps are indeed popular with the seniors in this sample, which is in line with the literature on this topic.812 Watching television and reading at bedtime are also frequent practices among older seniors. These are the most common of the five behaviors investigated, which also concurs with the findings in the literature.12,18,2932 Relaxation at bedtime shows lower levels of practice than those found in the literature.40 Caffeine consumption diminishes with age,19,27,55,56 so that we see that a low level of the elderly (in all of the groups combined) consume it in the evening. Finally, the seniors show a low level of practicing physical exercise in the evening, one that is lower than that reported in the literature.35,36

The second part of the objective was to determine whether these behaviors are associated with the probability of suffering from a mental disorder. We know that several sleep-related behaviors are associated with the elderly’s mental state, but that not all sleep-related behaviors show significant differences in the three groups, once we have controlled for the other variables. Thus, once we have controlled for the other sleep-related behaviors and the sociodemographic variables under study, three behaviors show significant results and can be considered as predictive factors for the presence of a mental disorder. As we mentioned earlier, relaxation, naps, and not using caffeine stand out as factors that can predict the person’s belonging to the anxious group.

As our findings show, seniors in the three groups are inclined to take naps; more than half of the participants in fact report that they take a nap. What we also know about naps is that developmental changes related to sleep that occur in asymptomatic elderly individuals can foster the popularity of this sleep habit: the need for sleep arises earlier and sleep is lighter, for example.67 These factors may reinforce people’s desire to catch up on sleep during the day. Anxious individuals also try to act against the perceived potential threat associated with their sleep being affected by this mental disorder, in order to compensate for the lost hours of sleep. This attitude, focusing on prevention and control, also seems to be consistent with the state of mind of many anxious persons. Naps are frequent in anxious seniors, and is associated with belonging to the group of individuals dealing with an anxiety disorder. These individuals tend to unconsciously avoid mental images and negative feelings and sensations associated with the perceived danger.68 Taking naps may represent a break: a way of putting their concerns, fears, and worries aside.69 Taking naps is not associated with the probability of suffering from a mood disorder, despite the fact that such a link has been found in the literature.15,27,28 Some authors70 have explored the probabilities of depressive persons taking more naps by measuring the number and duration of the naps. We can thus imagine that the association between naps and depression involves changes in sleep such as excessive daytime sleepiness or insomnia, which are frequent manifestations in depressive persons that may induce them to sleep during the day. So, only one short daily nap may not be associated with the probability of having a mood disorder, because the impact of the nap is minimal if it is brief. The fact of not measuring the duration of the nap may have an impact on the results obtained. The way that the questions were formulated in this study does not allow us to distinguish people who take many long naps from those who only take one short nap. The same is true for the time at which naps are taken and for the number of days, within a given period, when naps are taken.

In terms of physical exercise before bedtime in older individuals, the practice levels were low in this case. A minimal practice level could be associated with depressive symptoms,35 as the symptomatology includes loss of interest and great fatigue, so that fatigued elderly persons may possibly not feel the need to make themselves even more tired. In fact, doing exercises before bedtime was not found to be different in elders struggling with an anxiety or mood disorder. So the link between exercise at bedtime and mental disorders could simply be due to sleep problems. Indeed, exercises that are too intense are associated with increased sleep-onset latency, which may play a part in the vicious circle of frequent sleep problems in both anxious and depressive individuals. In this study, the type of physical exercises and their duration and intensity were not measured, and the association between this practice and the mental disorders may perhaps be based on these elements. Moreover, studies have more often measured the practicing of daytime physical exercises, unlike the present study, which specifies that this exercise takes place at bedtime, thus modifying the methodological conditions of studies that found associations with depression41,4650 or anxiety.40,48

A number of studies discuss the various mental health benefits of a relaxation practice,40,48,53,54 including, more specifically, a reduction in depression and anxiety.48,53,54 Relaxation enabled us to distinguish the groups formed according to the presence or absence of a mental disorder, and older participants suffering from a mental disorder show the highest practice levels, particularly anxious individuals. We know the cognitive processes present in anxiety disorders: hypervigilance, neurovegetative hyperactivity, and a state of tension.69 These elements represent a major motivation for a relaxation practice. We can hypothesize that anxious persons naturally tend to focus on this natural method, which is primarily targeted to stress and anxiety.71 Seniors affected by this mental disorder may also perform this activity ineffectively.72 So it would be beneficial if the therapeutic goals of relaxation were supported by a practice supervised by well-trained practitioners. Relaxation requires some training and some mastery. People trying to practice relaxing activities at bedtime without such support may become more stressed and thereby increase their anxiety. Finally, anxious older individuals who notice a gradual change in their state of health and living situation may want to increase their sense of power and control.68 On the other hand, the mental disposition of depressive persons tends toward apathy, loss of interest, and hypersomnia, and less toward emphasizing proactive means of improving their mood or their sleep, such as relaxation. We may thus presume that they do not feel the same need to relax and prepare for sleep that anxious persons do. Our results are in line with this: relaxing at bedtime is not associated with the probability of being affected by a mood disorder.

Watching television and reading before bedtime are popular with both asymptomatic elderly individuals and seniors dealing with a mental disorder. These behaviors do not show a link to the presence of a mental disorder, although older men struggling with a mental disorder often watch television for a greater number of hours than those without a mental disorder.34 We know, however, that certain maladaptive cognitions associated with the two types of mental disorders may influence the mental availability needed for these activities: concerns, fearful expectations, and excessive worries in the case of anxiety, or general psychic asthenia and lack of motivation in the case of depression.68,69,73 So, although asymptomatic elderly individuals may be more willing and able to practice these two types of activities in theory, our data do not tend to show this. The differences may perhaps be based on the type of reading or television shows watched: televised news, which is often during bedtime hours, may exacerbate a negative mood or anxiety, for example. Because the characteristics of these practices were not explored, we cannot presume the influence of these practices proportionally to the effective duration of watching television or reading, or to the type of shows or reading chosen. It would indeed appear useful, for both prevention and intervention, to verify the possible relationship between these two practices and the presence of an anxiety or mood disorder. A cross-sectional study cannot establish a causal link, which is why these two behaviors could be seen as either a possible cause, or a consequence, of the presence of these two types of disorders.

The link between the popular stimulant, caffeine, and the mental disorders differs according to the mental disorder. The low consumption found could lead one to believe that seniors fear that coffee will impair their sleep and simply just avoid consuming it, which is in keeping with an adjustment to the developmental changes in their metabolism. We in fact find that only one in five older individuals drinks coffee in the evening. We can also hypothesize that elders report little caffeine use because they strongly underestimate their consumption; the presence of caffeine in medication and/or food often goes unnoticed.27,40 It is found in a number of foods, beverages, and medications, including soft drinks, chocolate, analgesics, steroids, bronchodilators, high–blood pressure medication, and decongestants.20,21,38 Perhaps future studies can provide participants with a table or picture of caffeine content in different foods or beverages for a reference. The low levels of consumption may also be related to the fact that seniors know that they are sensitive to this stimulant.5860 We can hypothesize that older individuals dealing with a mood disorder tend to use this stimulant more to counter the decline in their energy and their fatigue. We find that caffeine consumption after 6 pm is indeed more strongly associated with the probability of suffering from depression rather than anxiety. Anxious older persons appear to avoid caffeine, which can indeed aggravate anxiety.74 In this regard, we in fact see that caffeine abstention is associated with the probability of struggling with an anxiety disorder. No studies were found concerning seniors’ caffeine consumption after 6 pm, regardless of whether they were affected by a mental disorder. The tendency of anxious individuals to avoid caffeine has been confirmed only in adults under 65 years of age.75 Some researchers have indeed associated caffeine use with anxiety, and low caffeine consumption is in fact linked to a greater probability of suffering from anxiety in adults.76,77 So verifications involving an elderly clientele add some interesting specifications in this regard.


The relationship of the various sleep-related behaviors to mental disorders in the elderly has been little studied, and the aim of the present study is to add to the knowledge held in this respect. This study is of interest in that, among other things, it involves a large sample of more than 2,000 participants, which is of random composition. The data come from structured interviews, which foster the validity of the information gathered. The characteristics of this sample are limited to the elderly population, but are comparable to those of the general population in Québec. Men and elders over 75 years of age are not underrepresented, and younger seniors have been differentiated from older ones, in accordance with the recommendations in the literature on this topic.78 In terms of recommendations, a more accurate measurement and verification of the actual caffeine consumption would appear to be relevant, as this consumption could have sizeable impacts and be strongly underestimated. It would also seem advisable to specify the type of television shows viewed before bedtime and to separate the practice of bedtime reading from that of watching television. It would be helpful to verify the practicing of physical exercise during the day as well, and to measure, in number of minutes, the time slept during naps. It would also be interesting to take into account the time at which naps are taken, and the seniors’ actual bedtime. Finally, there should be more details on the practicing of relaxing activities at bedtime, whether in terms of support and guidance or the type of activities practiced. This cross-sectional study does not enable one to assign causality to the variables. Conducting future studies using an experimental or quasi-experimental design will allow for more in-depth exploration of the significant associations found in the present study and will enable the elements mentioned earlier to be taken into account. And it is only at this point that clinical recommendations can be made.

This study has a number of clinical implications. To our knowledge, no other study has had as its topic of study of the systematic verification of the relations between sleep-related behaviors and anxiety and mood disorders in the elderly, the present results will therefore contribute to the knowledge on this subject. Also, the link found between certain sleep-related behaviors and mental disorders reminds us of the importance of treating these disorders as soon as they are detected so as to avoid having the elderly fall into a vicious circle of behaviors affecting sleep and mental disorders, and vice versa. It would be beneficial for research to be conducted to support the findings on behavioral differences between depressive and anxious seniors so that these behaviors can become further indicators of the presence of mental disorders. Several studies have observed the major repercussions of sleep hygiene on insomnia14,20,40,79,80 and mood,51 and in this regard, the specific effect of naps, caffeine, and relaxation is linked to the risk of suffering from anxiety. It is interesting to note that naps have not been related to mood disorders. We know that excessive daytime sleepiness is a symptom associated with mood disorders in the DSM-IV-TR. Thus, according to the present results, naps are not a manifestation of this hypersomnia in the group dealing with a mood disorder. This distinction allows us to add to the state of knowledge in regard to the expression of mood disorders. Despite the fact that it is often recommended that one limit the time spent in bed to sexual activities or sleep, in order to avoid intellectual stimulation that may impair sleep,20,21,27 the present study does not support any relationship between a stimulating activity and anxiety disorders. On the contrary, not drinking coffee in the evening and the practicing a relaxing activity have both been found to be related to anxiety disorders. This piece of data does not support the positive action generally associated with cognitive-behavioral therapy targeted to sleep habits for chronic insomnia.81 As already mentioned, it would be premature and risky to use the findings discussed earlier as a basis for making clinical recommendations. For example, drinking coffee in the evening and not practicing a relaxing activity at bedtime to protect against a potential mental health problem would represent an erroneous interpretation and an improper use of the results obtained in the present study.


This research was supported by the Fonds de recherche en santé du Québec. The authors would like to thank the research group from the Quebec Survey on Seniors’ Health (Enquête sur la santé des aînés) study and Michel Préville for the acquisition of funding and the collection of data.


The authors report no conflicts of interest in this work.



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