I halfway suspect he may have tried to sneak out of his room at night. Been reading some of the latest Duggar saga and supposedly Pest II's wife was arrested for having locks on the side of the door that the kids couldn't access (hence, the false imprisonment charge). I really wouldn't put it past those two especially with Oliver hating his naps to do something similar. The monitor would alert them to if he was trying to leave at night. To be fair sleep struggles can be something a ND kid deals with but I think this boils down to them not wanting to deal with the kids. I've never really paid attention to the doors to see if there were locks on the outside of the door but might explain why the kid couldn't leave when he was throwing a fit during that one live (wasn't he three or four at the time).