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. 2020 Oct 13:12:737-747.
doi: 10.2147/NSS.S269992. eCollection 2020.

Longitudinal Association Between Sleep Duration and Depressive Symptoms in Chinese Elderly

Rize Jing  1   2 , Tingting Xu  1   3 , Hongguo Rong  2 , Xiaozhen Lai  1 , Hai Fang  2   4   5
Affiliations

Longitudinal Association Between Sleep Duration and Depressive Symptoms in Chinese Elderly

Rize Jing et al. Nat Sci Sleep. .

Abstract

Aim: This study aimed to evaluate the longitudinal association between sleep duration and depressive symptoms among the elderly in China.

Methods: A data set from China Health and Retirement Longitudinal Study (CHARLS) in 2011, 2013 and 2015 was adopted with a total of 22,847 respondents aged ≥60-years-old. A linear regression analysis with generalized estimating equations was employed to examine the longitudinal associations between duration of total sleep, nighttime sleep and daytime nap, and depressive symptoms.

Results: An extra hour of total sleep including nighttime sleep and daytime nap was associated with lower incidence of depressive symptoms among the elderly after adjusting all confounders (OR=0.83, 95% CI: 0.82-0.84). In addition, an extra hour of nighttime sleep (OR=0.82, 95% CI: 0.80-0.83) or daytime nap (OR=0.93, 95% CI: 0.89-0.97) was also negatively associated with depressive symptoms among the elderly. After controlling the total sleep time, an extra hour of nighttime sleep was negatively associated with depressive symptoms (OR=0.88, 95% CI: 0.84 to 0.92), while an extra hour of daytime nap displayed a positive association with depressive symptoms (OR=0.88, 95% CI: 0.84 to 0.92). Compared with the moderate nappers, only extended nappers had significantly higher incidence of depressive symptoms (OR=1.32, 95% CI: 1.19 to 1.45).

Conclusion: For the elderly in China, increasing their total sleep, nighttime sleep, and/or daytime nap duration would reduce the incidence of depressive symptoms. Moreover, after fixing the total sleep time, increasing nighttime sleep was more beneficial to the decrease of the incidence of depressive symptoms than daytime nap.

Keywords: China; daytime nap; depressive symptoms; sleep duration; the elderly.

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Conflict of interest statement

The authors declare that they have no competing interests for this work.

Figures

Figure 1
Figure 1
Flow chart of sample selection.
See this image and copyright information in PMC

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