40 patients with Type 2 Diabetes Mellitus who also have sleep disorders and mild depression in the community will be recruited and stochastically divided into the intervention group and the control group. Both groups will take the same group education courses including DSME (Diabetes Self-management Education), psychological support, improvement in sleep. Patients in the intervention group will receive peer support and yoga music therapy before bed. The observation period will last for 6 months so as to evaluate the benefits of peer support and yoga music therapy in sleep quality improvement and glycemic control of type 2 diabetic patients with sleep disorders and mild depression.