Is this similar to waking up at night when you cut off circulation to your fingers and they’re cold and you can’t move them? Or is that just me?

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.)