my son fell at school and hit his head.. shortly after he got a headach so bad he said he felt as if his head was going to explode. Later that night he started puking a lot of blood and had a bloody nose. I took him into the er. they said he was fine and sent him home. My son went to school the next day and slept couldn't stay awake. The school sent him home. later that night he started running a fevor of 102.5 so I took him back to the er. they found a arachnoid cyst.All the blood work came back normal and since this visit my son has been sleeping non stop..most days hes awake for a total of 3 hrs if even that...is this NORMAL