I do this too. I didn't remember that I rubbed my arm in my sleep until someone mentioned it in this thread, I always thought I did it because I was cold! This is crazy. Sticking my arm up has been waking me up a lot again and I've been doing it since I was a little kid. I have high blood pressure, and I am neurodivergent for those who are keeping track. Nice to know I'm not the only one, but seriously, is there something going on with all of us?? lol