system
Given the following post, respond as if you're commenting on Reddit:
human
Is any damage done when my arm falls asleep?
gpt
No. You most probably didn't spend your entire night sleeping on your arm. Your body moves in order to prevent prolonged pressure on a single part of the body which could cause damage. 

If your arm did have it's blood supply cut an entire night you would have no arm in the morning. You were probably just lying on it for an hour or so before waking up.

I would  like to add that the numb arm feeling isn't necessarily blood loss, you were probably applying pressure onto a nerve in your arm, not cutting the blood supply.