Abstract
Background: We aimed to examine the longitudinal associations between daytime napping and nighttime sleep duration with the risk of diabetes mellitus (DM) among Chinese elderly using data from the China Health and Retirement Longitudinal Study (CHARLS). Methods: A cohort study was conducted among 2620 participants aged 60 years or above. Information on daytime napping and nighttime sleep duration was self-reported during the 2011 baseline survey. DM status during the 2015 follow-up survey was confirmed according to the American Diabetes Association criteria. Results: Individuals with long daytime napping (>1 h/day) had increased risk of developing DM than non-nappers (adjusted RR = 1.52, 95%CI: 1.10, 2.10). In addition, we observed a U-shaped association between nighttime sleep duration and incident DM risk. We further found that nappers with <4 h of nighttime sleep, and those with >1 h of daytime napping and >6 h nighttime sleep had approximately two-fold elevated risk of DM, compared to non-nappers with 6–8 h of nighttime sleep. Conclusion: Long daytime napping and extreme nighttime sleep duration were associated with increased DM risk among Chinese elderly. There was a joint effect of long daytime napping and nighttime sleep duration on the risk of DM.
Highlights
The present study indicated that long daytime napping (>1 h) was associated with increased diabetes mellitus (DM) risk in Chinese elderly, which was in line with previous studies [19,20]
We further showed that long daytime napping over 1 h and short nighttime sleep duration ≤4 h had the highest risk of DM, which was different from the findings in other two studies [12,24]
Further studies among older Chinese are needed to confirm the associations. This cohort study found that long daytime napping as well as short and long nighttime sleep were associated with increased risk of developing DM among older adults in China
Summary
Than non-nappers (adjusted RR = 1.52, 95%CI: 1.10, 2.10). We observed a U-shaped association between nighttime sleep duration and incident DM risk. We further found that nappers with 1 h of daytime napping and >6 h nighttime sleep had approximately two-fold elevated risk of DM, compared to non-nappers with 6–8 h of nighttime sleep. Conclusion: Long daytime napping and extreme nighttime sleep duration were associated with increased DM risk among Chinese elderly.
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