Drooling in bed may be caused by physiological and pathological factors. To solve the problem of drooling in bed, we should pay attention to oral hygiene and develop good brushing habits, or we can ask the dentist for consultation and treatment. First, physiological 1, underdevelopment: If the patient is still an infant, the cause of drooling may be caused by facial muscles are not yet well developed. At this time, the infant’s chewing ability is weak, and the mouth is shallow, so it is easy to appear the phenomenon of drooling; 2, improper sleep position: such as lying on the table, side-lying position and other sleep positions, so that the lips can not be closed, and then appear drooling symptoms; 3, oral cleaning is not in place: after eating, oral cleaning is not timely or cleaning is not complete, food residues are left on the teeth and teeth, inducing caries, periodontal disease, the stimulation of these adverse factors The stimulation of these undesirable factors can cause drooling when sleeping; 4, nerve center stimulation: if dreaming of food, or eating too much before going to bed, excessive drinking, or overexcitement, stimulating the nerve center of the brain, prompting increased secretion of saliva, so that drooling when sleeping. Second, pathological 1, oral diseases: such as mouth sores, pharyngitis, etc. Bacterial infection of the oral cavity, stimulating the secretion of saliva, there will be increased saliva, drooling in bed; 2, neuromodulation disorders: such as facial nerve palsy, Alzheimer’s disease, due to disorders in the regulation of the nerves governing the oral and facial movements, abnormal excitation of the parasympathetic nerve, resulting in drooling in bed; 3, dental malformation: due to genetics or some bad habits, such as nail chewing, pencil biting, etc., so that the front teeth are malformed, so that When the patient sleeps, the lips can not completely cover the teeth, which in turn leads to sleep drooling; 4, digestive system diseases: such as digestive dysfunction leading to acid reflux, stimulation induced sleep drooling; 5, other: stroke precursors, arteriosclerosis, sleep apnea syndrome, nasal blockage and other conditions, may also lead to sleep drooling. If necessary, go to the hospital for relevant examinations, clear diagnosis and early treatment to avoid delaying the condition.