Drooling at night can be caused by a variety of reasons, generally considered to be caused by improper sleep posture, stomatological diseases, cerebrovascular disease precursors, facial nerve paralysis and other causes. It is necessary for the physician to take appropriate treatment measures and methods according to the different causes of the patient. 1. Improper sleep posture: when the human body sleeps on its stomach, or sleeps on its side with its head facing down, it is easy to cause drooling. 2. Oral diseases: for example, when patients suffer from dental caries, periodontal disease, pulpitis and other diseases can stimulate increased salivary secretion, which leads to the performance of night drooling. 3. Cerebrovascular disease precursor: for example, if the patient suffers from cerebral infarction, cerebral hemorrhage and other diseases, dizziness, headache, drooling, numbness and weakness of the limbs and other manifestations. 4. Facial nerve paralysis: Facial muscle paralysis caused by damage to the facial nerve, which can be manifested as crooked corners of the mouth on the sick side, leakage of wind in speech, salivation (drooling) and other manifestations. There may be other reasons, it is recommended to go to the hospital in time, after a clear diagnosis of the cause of the targeted treatment.