Is it normal to drool when sleeping?
Yep.Totally normal
Yes—drooling while you sleep is common and usually harmless. It often happens when you sleep on your side or your mouth falls open.
When you’re asleep, your muscles relax and you swallow less often, so saliva can escape instead of being swallowed. Sleeping on your side or stomach, a stuffy nose, or breathing through your mouth can make it more likely. Lots of people wake up with a little evidence on the pillow now and then; it’s not exactly glamorous, but it’s normal.
If it’s suddenly much heavier than usual or comes with trouble swallowing, choking, or other new symptoms, get it checked out. Otherwise, it’s generally just one of sleep’s less charming habits.