Drooling occasionally during sleep is completely normal and usually nothing to worry about. It tends to happen during deep sleep when your facial muscles relax or if you sleep on your side. In these cases, it’s simply a part of how your body rests.
However, you might want to pay attention if drooling is new, excessive, persistent, or noticeably one-sided. These changes can sometimes signal underlying health or lifestyle factors that deserve a closer look.
Common Causes
1. Nasal Congestion
Allergies, colds, sinus infections, or a deviated septum can make it hard to breathe through your nose. This forces you to breathe through your mouth at night, which makes drooling more likely. You might also notice snoring, a dry mouth in the morning, or restless sleep. Treating nasal irritation often helps reduce nighttime drooling.
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