Impact of night sleep duration on glycemic and triglyceride levels in Chinese with different glycemic status

BackgroundThe aim of the present study was to assess the relationship between night sleep duration and glycemic and triglyceride (TG) levels among people with different glycemic status. MethodsIn all, 18121 subjects aged 40 years were enrolled in this cross-sectional study, including 4318 with impaired glucose regulation (IGR), 4225 with diabetes, and 9578 with normal glucose regulation (NGR). The IGR+diabetes and NGR groups were divided into three subgroups according to self-reported night sleep duration as follows: (i) <6h; (ii) 6-9h; and (iii) >9h. The associations of sleep duration with HbA1c, fasting plasma glucose (FPG), 2-h post-load plasma glucose (PPG), and TG levels were examined. ResultsLong night sleep duration (>9h) was associated with higher HbA1c, FPG, PPG, and TG levels compared with sleep duration of 6-9h (P<0.01 for all) in the IGR+diabetes group, but not in the NGR group. This association was adjusted for potential confounders, including body mass index and depressive symptoms, and remained significant even after adjusting for snoring. A significant interaction between sleep duration and TG or snoring was observed for HbA1c levels, which attenuated the sleep-HbA1c association in the IGR+diabetes group. However, no significant association was observed between short night sleep duration and HbA1c levels. ConclusionsLong night sleep duration is associated with higher HbA1c, FPG, PPG, and TG levels in IGR and diabetes patients, independent of potential confounders. This may be important in clinical management of IGR and diabetes patients.