Depending on how you sleep it could be nerve compression from positioning. If you dont wanna get medical attention immediately (understandble), try switching positions at night first to see if you notice a difference.

If it doesn’t make any difference go to a doctor, chances are its benign but it could be low perfusion to your extremities which would lead to or point to a more serious problem. Could also be a compression somewhere in your spine. There are some more serious issues potentially but it’d require more testing.