The causes of diabetes want to sleep mainly include poor blood sugar control, as well as the emergence of diabetes complications such as cerebrovascular disease, diabetic ketoacidosis, etc., need to go to the hospital in time to improve the examination for differential diagnosis. 1. High blood sugar: diabetic patients if the treatment effect is not ideal, can lead to poor control of blood sugar, and long-term high blood sugar can lead to high plasma osmolality, affecting the metabolism of the tissue cells, especially muscle and nerve metabolism, which leads to fatigue and want to sleep and other phenomena. 2. Diabetes complications: cerebrovascular disease: diabetic patients with poor blood glucose control, resulting in long-term hyperglycemia, cerebrovascular disease can be complicated by the emergence of cerebral infarction. Cerebral infarction can lead to cerebral tissue ischemia and hypoxia, which can cause sleepiness and headache and other uncomfortable symptoms. Diabetic ketoacidosis: It is a serious metabolic disorder syndrome caused by insufficient insulin secretion and excessive insulin-antagonist hormone, which can lead to deep and fast breathing, dry mouth, headache and different degrees of consciousness disorders, and some of the patients with mild disease can show sleepiness and fatigue. In addition, diabetic patients with hypoglycemia can also lead to the phenomenon of sleepiness, so it is best to go to the hospital in a timely manner to consult and identify, according to the results of the diagnosis for reasonable treatment.