I frequently sleep on my arm in such a way that it falls asleep. It’s really annoying because it wakes me up and I have to use my good arm to flop the sleeping one into a better position. The funniest time was when I fell asleep with my arm behind my head. I woke up looking at a hand right near my face that I couldn’t feel and didn’t recognize as my own. I tried to sit up in shock but the arm that I would have used to push myself up was the one that was asleep. I collapsed back into the pillow, laughing, when I realized what had happened.