Drooling while sleeping may indicate underlying health issues. Xiao Liang, a 25-year-old programmer in China, experienced excessive drooling due to long work hours and poor sleep habits. Causes of Drooling in Adults Oral Diseases – Conditions like gingivitis or ill-fitting dentures can increase saliva production. Facial Paralysis – Muscle weakness on one side of the face can prevent saliva control. Gastroesophageal Reflux – Acid reflux triggers excessive salivation. Parkinson’s Disease – Impaired swallowing leads to drooling. Cerebral Thrombosis – Blocked brain vessels affect muscle control. Arteriosclerosis – Reduced oxygen supply weakens facial muscles. Prevention Tips Change Sleeping Position – Sleeping on your back reduces drooling. Maintain Oral Hygiene – Brush, floss, and rinse daily. Review Medications – Consult a doctor if medication may be the cause