If you drool while you sleep, it’s a sign that your brain..

If you drool while you sleep, it’s a sign that your brain is in a deep sleep stage and your muscles are fully relaxed.

During REM (Rapid Eye Movement) sleep or deep sleep, the brain signals your body to relax almost completely. This includes the muscles in your face and mouth. As a result:

Saliva can escape from your mouth more easily, leading to drooling.

It often indicates you’re sleeping deeply and comfortably.

Other factors that can contribute to drooling:

Sleeping on your side or stomach

Nasal congestion or blocked airways

Certain medications or neurological conditions

💡 In general: Occasional drooling during sleep is normal and usually harmless.