Effect of Diabetes Sleep Education for T2DM Who Sleep After Midnight: A Pilot Study from China.

BACKGROUND: Our prior study showed that patients with sleep disorders had poor blood pressure (BP), glycemic control, and more severe complications. Therefore, sleep is very important for diabetic control. Our work was to investigate whether individualized diabetes sleep education significantly improve sleep quality and glycemic control in type 2 diabetic patients who sleep after midnight and potential mechanism by a randomized parallel interventional study.

METHODS: T2D patients were randomly recruited to an intervention or control group. Patients received structured special diabetes sleep education program with 3-month follow-up. Pittsburg Sleep Quality Index (PSQI) was scored for each participant. Demographic data, HbA1c, biochemical, and some hormones were also examined. SPSS 13.0 was used for statistical analysis.

RESULTS: One hundred patients were approached, and 45 were enrolled into our trial. Eventually, 31 patients completed the study. Patients in the intervention group greatly improved their sleep hygiene. After intervention, PSQI scores were lowered significantly (-1.48 ± 0.88 vs. -0.51 ± 0.71, P < 0.001), as well as significant reduction of HbA1c (-1.5 ± 0.55 vs. -1.11 ± 0.47, P < 0.05). Fasting plasma glucose was also lowered significantly. Homeostasis model assessment of insulin resistance was reduced significantly (-1.29 ± 0.97 vs. 1.04 ± 0.91, P < 0.01). Serum concentrations for interleukin (IL)-6, cortisol, and ghrelin were decreased significantly. Ghrelin (coefficients -0.65, P < 0.001), cortisol (coefficients -0.38, P < 0.05), and IL-6 (coefficients 0.452, P < 0.05) were correlated with HbA1c improvement. The change of ghrelin was negatively associated with the improvement of HbA1c.

CONCLUSION: Diabetes sleep education could improve sleep quality, better blood glucose and BP, and decrease insulin resistance through healthier sleep hygiene. Lower serum concentration of ghrelin might be partly involved in the reduction of HbA1c.