If it isn't one thing, its another

So my DH had a really busy July, so he cancelled his subscription to WOW. When he became less busy he didn't resubscribe, he started playing other games. He has been playing one called Raven Shield lately. He's totally obsessed with it too. Before that he was playing a game I don't know the name of, but he'd get so into it that he'd stay up until 2 or 3 on a weeknight. Ugh. Why can't he just regulate it a little? Why is it that when he's playing he loses all track of time, hunger, thirst, need to pee, common sense, etc.