I just fell and hit my head on a nightstand. just above my forehead. how long should i wait before going to sleep?

Ouch!: Sorry you bonked your head. The deal with head injuries is this: it's not the going to sleep that's important. If you feel okay after bumping your head (other than slight bruise symptoms), then you should be awoken every 2 hour by someone for the next 24 hours to make sure you are okay and you are alert, and your pupils are equal and you can move your arms and legs fine. Take tylenol (acetaminophen) not motrin