I was wondering how heard you have to hit your head for there to be a brain problem? Can a small bump injure you? I was laying next to my sister in the same bed and I rolled over and we bumped heads while I was awake but she is asleep, do you think this could cause a problem?
The brain is very protected from small bumps for the most part. If ya'll slammed into each other and you had loss of consciousness, severe headache, or motor/cognitive skill impairement, then I would say seek medical treatment.