I Wake Up Every Morning To Find Myself Drowning In

I wake up every morning to find myself drowning in my saliva which is very disgusting.That's why I try to keep my mouth closed during sleep but sometimes it's open and then the stored saliva in my mouth comes out all the way, and I probably think that I don't breathe through mouth or anything.I turned 17 in December last year.I think I have problems with shallowing.When I was about 10-13 years old I discovered 2 little glands under my tounge and I kept pulling it as I didn't know what it was.after some days of that incident I started drooling.Do u know if this has any connection with my problem??