can numbness during sleep be dangerous?

Like when you sleep in a wrong position and your body is weighting on your hand. can this lead to anything bad if you don't wake up and start moving your hands/fingers?

?2015-03-13T07:36:07Z

if you don't wake up, you are obviously dead - in extreme cases, if you weigh 500 pounds and sleep on a board and do that, it might cut off circulation and kill your arm