If you were to open up a baby's head - and I am not for a moment suggesting that you should - you would find nothing but an enormous drool gland.
Sometimes I cry in my dreams, and I wake up because my pillow is sopping wet. Was I sobbing in my sleep? Hardly. But I was drooling.?
A woman only drools on a man when she can't swallow his pride. It would be sacrificing her integrity to drool on the furniture.
You drool when you sleep.