For me, if I were the kid who was woken up, it wouldn’t be the whole halachic aspect that would bother me- it would be the fact that omeone woke me up to correct the way that I was sleeping.
Are these kids already baalei teshuva or not frum at all? If they’re not frum at all, then I don’t think it’s a good idea to regulate what they do in private AT ALL.