8. Neurological Conditions
Conditions such as stroke, Parkinson’s disease, Alzheimer’s, Huntington’s disease, Bell’s Palsy, Cerebral Palsy, ALS, and brain damage can lead to sialorrhea, making it harder to swallow and causing drooling during sleep. Interestingly enough, a vitamin B12 deficiency can also lead to drooling issues. This is because a deficiency in B12 can also lead to neurological problems, hence the drooling.