Sleeping 3 year old

Well it is now almost 12:30 PM and the three year old is still asleep. He was gone all day Tuesday with his mother which means he didn't take any sort of nap that day. Then she keeps her TV running all night long so he lays there and plays and watches TV while she sleeps like a baby. Then yesterday she took him to the home of the married man that she sleeps with and I use the term sleep very loosely. He was supposed to be part of a birthday party for this guys kid. She finally brought him home about 10:30 PM last night and you could tell he had been asleep in her car. Well at 11:30 he went to the kitchen with her while she popped pop corn and got them both drinks. So guess he watched TV all night long again last night. So now she is at work and he is sleeping like he should have last night. We have tried to tell the mother that her kids are staying awake all night long while she sleeps but she doesn't think anybody knows anything but her. I really do feel sorry for the kids.