Our expert says:
signs of a serious head injury are a change in conciousness, pupil size changes, drowsyness, vomiting and fits. However, often they get a fright and scream so much that they actually go to sleep because they are tired and shocked! So I agree with your friends, try to calm him down and keep him awake for about an hour or so after a fall, and if he goes to sleep, wake him up after half an hour or so to see if he is still conscious and lucid. If he is he can go back to sleep. Check his pupils and whether he can walk and talk normally.
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