Patients will be identified from the Diabetes Mellitus and Endocrine Centre of Prince of Wales Hospital and Yao Chung Kit Diabetes Assessment Centre, The Chinese University of Hong Kong. All participants will have diabetes complications screening and comphrensive evaluations for glycemic control and cardiometabolic risk factors.Eligible subjects will be randomized to 2 groups (usual or conventional care versus intervention with sleep education program) for 12 months.