Long sleep duration and afternoon napping are associated with higher risk of incident diabetes in middle-aged and older Chinese: the Dongfeng-Tongji cohort study

摘要

Background In this study, we investigated the independent and combined effects of sleep duration and afternoon napping on the risk of incident diabetes among a cohort of middle-aged and older Chinese adults.Methods Information of sleep and napping was obtained by questionnaires during face-to-face interviews. We categorized sleep duration into<7h, 7 approximate to<8h (reference), 8 approximate to<9h, 9 approximate to<10h, and10h. Afternoon napping was divided into no napping (0min) (reference), 1-30min, 31-60min, 61-90min, and>90min. Cox proportional hazard regression models were used.Results Compared with referential sleeping group, subjects sleeping10h had a 42% higher risk of developing diabetes. The HR was 1.28 for napping>90min when compared with no napping. These associations were more pronounced in individuals without hypertension. Combined effects of long sleep duration and afternoon napping were further identified. Individuals with both sleep duration10h and napping>60min had a 72% higher risk of incident diabetes than those with sleeping 7 approximate to<8h and napping 0min (all above p<0.05).Conclusions Both long sleep duration and afternoon napping were independently and jointly associated with higher risk of incident diabetes.Key messagesSleep duration was associated with diabetes, but whether it is a real cause of incident diabetes especially in Chinese still remains to be elucidated.The association of afternoon napping and diabetes was not consistent and definite, we clarified this association in a large prospective study.Long sleep duration and afternoon napping were independently and jointly associated with higher risk of incident diabetes.