The main reasons for drooling in bed are as follows: first, due to the lips can not be closed, resulting in drooling in bed, the lips can not be closed mostly due to the existence of open jaw deformity of the upper and lower front teeth, the upper and lower teeth protrude, the lips can not be closed naturally in sleep, causing drooling in bed; second, the existence of chronic inflammation in the mouth, such as dental caries, periapical periodontitis, wisdom teeth pericoronitis, oral mucosal ulcers, herpes and other diseases, due to inflammation and Thirdly, people who eat too much before going to bed, or have gastric ulcer, cholecystitis and other digestive system diseases, due to indigestion, food accumulation or abdominal discomfort, will also have the phenomenon of drooling in bed; Fourthly, due to poor sleep posture, people who love to sleep on their stomachs will drool in bed; Fifthly, people who suffer from rhinitis, sinusitis and nasal septum distortion Fifth, people with rhinitis, sinusitis and nasal septum distortion, due to the nasal cavity is not ventilated, forcing open-mouth breathing when sleeping, will also lead to drooling.