How do you do that to just your fingers? For me it’s usually the whole arm from somewhere between the shoulder and elbow.
Sounds like a different issue. There is one that arms go numb if hands held above head for a minute. That was can be helped with the right exercise. (But see a doctor for diagnosis if it bothers you.)
Thanks for your concern! It’s not super bothersome. I think I just sleep weird. I toss and turn a lot and end up in less-than-ideal positions.