Drooling at night is usually caused by overwork, stroke and other reasons. 1. Overwork: overwork of the body during the day may lead to autonomic nervous system dysfunction, causing excessive secretion of salivary glands, which leads to drooling at night. Or sleeping position is not correct, open mouth breathing, drooling. Patients should reasonably improve the quality of sleep, can adopt a light diet, while life can listen to some soothing music. 2. Stroke: patients may have central facial paralysis and other symptoms, mainly manifested as drooling, crooked corners of the mouth, numbness of the limbs and other symptoms, patients should consult the hospital in a timely manner, symptomatic treatment of the disease. Patients drooling at night may also be nerve paralysis, cerebral palsy and other causes, it is recommended that patients go to the hospital in time for examination.