For goodness sake.
This post quite possibly answers the question that so many of us ask.. where did it all go wrong?
Imagining the scenario, even reenacting it, it sounds as if he has tapped the kid as a means of getting their attention before telling them, yet again, to pack it in.
He hasn't punched, slapped, aggressively and violently assulated this child nor has he abused this child In any way. He also, by the sounds of it, hasnt committed a crime.
If the parents are over reacting in the same way some of the people in these comments are then what is that teaching the child?
This whole scenario should be discussed in a way of.. where did the kid go wrong.(their response of ignoring the request/instruction the first time round) and where did the adult go wrong (they were maybe frustrated but a normal emotion to the situation however how could they have handled it differently) and how could this scenario be handled better, by both parties, should it ever happen again.
Each has played a part but the responses of phoning the police, I would be so angry etc .. is where we are going wrong. What does putting all the blame onto the adult in this case teach this child? And how will it fuel their future behaviours - especially around adults trying to instruct/discipline them.
As for him sleeping, not an issue.