Drooling during sleep is common and usually harmless. It occurs when saliva builds up and isn’t swallowed, often due to sleep position, relaxed muscles, or mouth breathing. Sleeping on your side or stomach makes it more likely, as gravity allows saliva to flow outward, while deeper sleep stages further relax facial muscles and reduce control. Other factors can contribute, including allergies, nasal congestion, or medications that affect saliva production. In most cases, occasional drooling is completely normal and not something to worry about. However, frequent or excessive drooling—especially if paired with symptoms like choking, sore throat, or daytime fatigue—may signal...
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