well I thought of another one - I quite often would scrape my face with my fingernail while sleeping. Usually would NOT wake up while doing it, just see it in the mirror in the morning. Did you ever try to draw blood with your fingernail? It is NOT easy. Don't know why it wouldn't wake me up, or why I did it.
Now I wear wrist splints for carpal tunnel every night and it keeps my hands away from my face. However one night I scraped a mole off my shoulder while sleeping, Man did that bleed. The dermatologist was nice enough to take off the whole thing for me, she had never seen anything like it.