Lmaooo, this happened to me once. I was laying on my stomach too
Woke up but couldn't move and I felt something walking up the end of the bed, crawling over my back towards my head

I don't know why but I knew in my heart that that shyt was a big ass racc00n
I could hear my mom and sisters talking outside my door so I yelled my sisters name and nothing came out

Even if she would have heard me that scary heffa would have ran the other way.
When I finally got up I left the room like "Wtf!!!

Y'all ain't hear me in there screaming?!?!? Y'ALL AIN'T TRY TO SAVE ME!!!

" They didn't hear anything so I just laid back down and went to sleep. Wasn't any racc00ns in there so I had no trouble going back to sleep.