The symptoms of occasional drooling in bed may be caused by improper sleeping posture or mental stress in some patients, and can usually be relieved after changing sleeping posture or adjusting emotions. Infants may also have the symptom of drooling in bed due to imperfect development of facial muscles and weak swallowing ability, which is usually a normal physiological phenomenon. If patients often drool in bed or with other symptoms, it may be caused by some diseases: 1, oral diseases: such as oral ulcers, gingivitis, periodontitis and other diseases, may stimulate the salivary glands, so that the salivary glands secrete more saliva, resulting in drooling in bed; 2, dental malformations: some dental patients with front teeth protruding forward, the lips can not completely cover the front teeth when sleeping, which may lead to sleep Drooling; 3, gastrointestinal dysfunction: some patients due to gastrointestinal dysfunction, such as gastrointestinal peristalsis or endocrine function disorders, can cause patients to have increased saliva, resulting in patients with drooling while sleeping; 4, neuropathy: such as facial nerve palsy, Parkinson’s disease, cerebral palsy, etc., because of facial motor nerve regulation disorders, can lead to drooling while sleeping. Some patients who have facial nerve damage and other conditions, resulting in facial muscles can not control the outflow of saliva, may cause patients to sleep with drooling symptoms; 5, cardiovascular lesions: some cardiovascular lesions may lead to atherosclerosis, facial muscle ischemia, lack of oxygen, resulting in facial muscle atrophy, thus causing patients to sleep with drooling. In addition, the influence of some drugs, hypertension, hyperlipidemia, diabetes, stroke and other reasons may also cause patients to appear drooling in bed. It is recommended that if patients have heavy symptoms or are accompanied by other symptoms, they should go to a regular hospital for timely consultation and symptomatic treatment.