What causes drooling during sleep?

Drooling during sleep, medically known as nocturnal sialorrhea, may be caused by various factors. Common causes include: 1. Improper sleeping posture: Sleeping on your side or stomach can naturally tilt the mouth, leading to saliva leakage. 2. Oral health issues: Conditions such as periodontitis, dental caries, and oral ulcers may increase saliva production and impair swallowing during sleep, resulting in drooling. 3. Digestive system problems: Gastroesophageal reflux disease (GERD) or indigestion may stimulate the salivary glands to produce more saliva. 4. Neuromuscular disorders: Conditions such as facial nerve paralysis or other neurological diseases can affect the normal movement of chewing and tongue muscles, impairing saliva control. 5. Medication side effects: Certain medications may alter the function of the salivary glands, leading to excessive saliva production. 6. Excessive fatigue: Extreme tiredness or poor sleep quality may also contribute to nighttime drooling. Although drooling during sleep is usually harmless, frequent occurrences or those accompanied by other symptoms should be evaluated by a healthcare professional.