-Sleeping position where your mouth is in a dependent position ( i.e sleeping on your stomach) then saliva can easily seep out of your mouth onto the pillow.If you sleep on your back, this should resolve the problem
-Drooling can be a sign of a sleep apnea (if you have a lot of snoring, breathing pauses, and daytime sleepiness). In this case, you have to check with your physician for your sleep apnea.
-Treat any nasal obstructions or allergies that cause you to sleep with your mouth open.
-Treat any dental infections because it can trigger excessive saliva production while sleeping.
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