continues to be produced, however, even while you are sleeping. When it accumulates faster than you swallow it, some of the excess can escape through your mouth and end up on your pillow.
Your sleeping position can also make a noticeable difference. People who sleep on their stomachs or sides may be more likely to drool because gravity can encourage saliva to move toward the edge of the mouth.
Sleeping on your back, by contrast, may reduce drooling for some people. In this position, gravity generally helps keep saliva inside
