I have numbness down right side of face and head. Did I sleep wrong or something happened to my nerve?

Depends. If the numbness doesn't last very long then it might be caused by pressure on the nerve while sleeping. If this lasts longer than a few minutes then it could be something much more serious and it should be carefully evaluated by a specialist.
Yes. Any time you have numbness, something has happened to the sensory nerve carrying information to your brain. Very rarely it is due to damage in the brain itself. Too much alcohol can cause numbing of the face nerves. If it persists you must see a neurologist.