My son hit his head yesterday, during swimming. Today took him to the clinic, doc said he was okay. But we took him whe he just woke up because he was complaining of headache. Kept him home from school,and went straight to bed again. He has been sleeping ever since. So he slept 9 hrs at night, woke up ,went to doc,went back to bed and now has slepy an extra 5hrs. Do I wake him up?