Diabetes mellitus dry mouth in bed at night may be caused by high blood glucose, but also may be caused by drinking too little water or dietary reasons, it is recommended to consult a doctor. Diabetic patients with poor glycemic control and persistently elevated blood glucose may experience osmotic diuresis, and the patient may urinate frequently and in large quantities, causing excessive loss of water from the body, followed by symptoms of dry mouth, thirst, and excessive drinking. Diabetes sleep at night cause dry mouth if related to high blood sugar, need to take oral hypoglycemic drugs, such as metformin, acarbose, etc., under the guidance of the doctor and, or at the same time, inject insulin to control blood sugar. Diabetic patients pay attention to light dinner, appropriate exercise after meals, may improve the symptoms of dry mouth. Diabetes dry mouth in bed at night must not be ignored, and blood sugar should be monitored regularly. If the phenomenon of persistent blood sugar does not drop, you should go to the hospital in time.