If you drool while

Drooling while sleeping is usually harmless and can actually be a sign that your brain is deeply relaxed. It often happens during deep or REM sleep when your muscles fully relax and your swallowing reflex slows, allowing saliva to collect and escape from the mouth.

Your sleeping position plays a big role. People who sleep on their sides or stomachs tend to drool more because of gravity. Switching to sleeping on your back may help reduce it.

Nasal congestion from allergies or a cold can also cause you to breathe through your mouth, which increases the likelihood of drooling during the night.

In some cases, drooling may be due to an excess of saliva. This could be caused by certain medications, acid reflux (GERD), or naturally high saliva production.

More serious causes include neurological conditions. Sleep disorders like sleep apnea, or illnesses such as Parkinson’s disease or a history of stroke, can affect facial muscles and lead to drooling.

While occasional drooling is generally nothing to worry about, consistent or sudden changes—especially if accompanied by snoring, choking, or fatigue—should prompt a visit to the doctor.

To reduce drooling, try sleeping on your back, managing allergies, staying hydrated, checking medications, and seeking evaluation for sleep disorders. Most of the time, it’s a sign of good rest—but if it becomes excessive or disruptive, it’s best not to ignore it.