Occasional drooling during sleep is very common and usually harmless. It often happens during deep sleep, when facial muscles relax, or when someone sleeps on their side. In these cases, it is simply part of normal sleep behavior.
Concern may arise when drooling is new, excessive, persistent, or clearly one-sided. These changes can sometimes point to underlying health or lifestyle factors worth noticing.
One frequent cause is nasal congestion. Allergies, colds, sinus infections, or a deviated septum can block nasal airflow, leading to mouth breathing at night. When the mouth stays open, saliva is more likely to escape.
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