Sleeping drooling, also known as sleep drooling, has the following causes: 1, considered to be caused by improper sleeping posture, especially the long time side lying position, resulting in this side of the cheeks affected can appear sleep drooling. 2, can also be seen in the oral cavity local inflammation stimulation, resulting in increased secretion of liquid in the oral cavity drooling. 3, Chinese medicine is also said to be due to the spleen and stomach weakness, or eating too much food and greasy and food accumulation. 4, clinically can also be seen in malocclusion, especially the teeth protruding from the mouth outside, can also cause the phenomenon of sleep drooling. 5, oral medicine to strengthen the spleen and dampness. The food stagnation caused by the oral spleen and dampness medication. 4, clinically can also be seen in the malformation of the teeth, especially teeth protruding outside the mouth, can also cause the phenomenon of drooling in bed. 5, clinically there are a small number of patients is due to cerebrovascular disease, cerebrovascular disease leads to facial muscle dysfunction, there can be the phenomenon of drooling in bed. 6, the cerebral vascular disease can be seen on the face of the face, the face can be seen on the face of the face, the face can be seen on the face of the mouth.