Hypersalivation is not neurological, where saliva comes in is if you drool when you are awake and can't swallow it. Drooling during sleep is also common. Try chewing gum if it's bothering you.
i am a big night drooler and always have been. i breathe through my mouth so it is always open and i sleep on my side. i can wake up in a lake of saliva on a good night. since i have alwsy been this way i assume it is normal.
