Sleep Duration and Cognition in Older Adults: A Moderated Mediation Model.

OBJECTIVES

This study aimed to examine the association between sleep duration and cognition in older adults, explore the mediating role of depression and the moderating effects of self-perceived help and self-rated health on the relationship.

SUBJECTS AND

METHODS

Using a nationally representative data set, China Health and Retirement Longitudinal Study. A total of 6832 adults aged 60 and older were selected from it. Data were analyzed using SPSS 26.0 and SPSS PROCESS Macro (Model 4, Model 59, and Model 76).

RESULTS

Results showed that depression mediates the relationship between sleep duration and cognition. The indirect effect of the mediation model were moderated by self-perceived help and self-rated health, and just significantly moderated the first half of the model. The simultaneous moderation of self-perceived help and self-rated health were more significant effect of sleep duration on depression.

CONCLUSIONS

Depression, self-perceived help and self-rated health may play a role in sleep and cognition. Policy interventions such as getting more help should be effective to reduce depression and improve cognition.