Yes, your brain has its own “cleaning crew” — the glymphatic system — and it’s most active during deep sleep.
Drooling may just be proof that system is doing its job!
But When Is Drooling a Problem?
Too much drool?
Or a new habit that just started?
It could be a sign of:
- Allergies or sinus congestion
- Acid reflux
- Poor sleeping posture
- Sleep apnea or neurological issues (in rare cases)
What You Can Do
If it bothers you:
- Sleep on your back
- Use a thinner pillow to adjust neck position
- Avoid heavy meals before bed
- Check for allergies or breathing issues
But in most cases, that bit of drool is nothing to worry about.
It just means your body is finally relaxing and your brain is loving it. 
