Any chance your bodice is tight? I used to (like teens and early adulthood) wake up unable to move one or both hands or arms, having to sling and flail to get them moving, and finally decided to get some medical help, although it always wore off quickly. But before I made the appointment I thought, what if the blood is getting cut off ? It never happened when I wasn't wearing a pajama top/tee-shirt, so I started cutting the armpits out of any shirts I wore to bed, and the problem disappeared completely. These days on a cool night (freezing cold to Mary )) I just wear the tee-shirts I have left over from when I was 2x-L and larger.