Rachel, is it because you have been lying on your arm? Cause its
quite common to get numb from having your whole bodies weight on
something.
If not, are you 100% sure that you are not dreaming it? Sounds
stupid I know, but sometimes you get these horrible dreams where
you can't move, and if you are only half awake, it is possible it is not
entirely real?
If not, then like you said, better to go and see a doc. Just to put your
mind at rest. Might not be anything to worry about at all, but better to
get it checked out.
Laugh, quick, before you cry....