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It affects how much saliva is released on the pillow in the morning. When a sleeper is lying on their back, gravity causes excess saliva to remain in their mouth or go down their throat. However, for people who sleep on their side or stomach, gravity pulls their saliva to the pillow, resulting in drooling.
If you’re a side or stomach sleeper and sleep with your mouth open, you’ll be even more likely to drool while sleeping. Sleeping on your back can help reduce leakage. You can also take measures to cover your mouth when you breathe through your nose or sleep, such as using masking tape.
Infections and allergies
If you have a cold, strep throat, or seasonal allergies, these conditions can cause your sinuses to become inflamed, blocking your airways, causing you to breathe through your mouth and drool more than usual.
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