Drooling in the sleep of adults is not necessarily a precursor to serious illness, but may be associated with oral problems, neuromodulation disorders, dental malformations or other diseases. 1. Oral problems (1) Physiological factors: If it is caused by physiological factors such as poor oral cleaning or improper sleeping posture, it is usually not a precursor of any disease. (2) Oral diseases: such as periodontitis, pharyngitis and other bacterial infections related diseases, can also appear in the sleep drooling, usually is not a very serious disease. (2) Neuromodulation disorders: Diseases such as facial nerve palsy may cause drooling during sleep due to neuromodulation disorders in the innervated area. 3. Malocclusion: If the teeth are malformed and the front teeth protrude forward obviously, it is difficult for the lips to cover the front teeth completely when sleeping, which can also lead to drooling in sleep. 4. Other diseases: if the stroke or arteriosclerosis and other diseases, can also cause drooling in bed, so when you suspect that there is a stroke and other conditions, you need to consult a doctor in time for treatment. As you can see, adults who drool in their sleep need to first identify the cause of the disease and pay attention to whether they have the above situation, if it is very serious, it is recommended to consult a doctor in a timely manner.