Do you or someone you love have a video games addiction?

I have been wondering recently if my brother might be struggling with gaming addiction.

He sits up until the early hours playing Wii games such as CoD or PC games such as WoW and can't drag himself out of bed in the morning. He even fell asleep whilst he was in a university lecture the other day! My brother also isn't very sociable and doesn't see much interaction other than those "friends" he'll play games with online.

Not knowing the criteria for spotting an addiction to video games, I turned to the internet which pointed to 5 main behavioural traits to keep an eye out for...

1. Do you notice a significant different in your happiness levels between those time that you are video gaming and those time that you are not? Are you angry and upset when something interrupts your gaming session?
2. Do you spend significantly more time attached to your keyboard or gaming pad as opposed to seeing friends and family? Social interaction is important for our mental happiness.
3. Do you think about or actually - play video games when you have other things that your should be focusing on like a job or course work? Do you fall behind on your responsibilities often?
4. Are you untruthful regarding what you spend your time doing? Are you worried secretly that you have an addiction?
5. Are you having difficulty falling asleep at night? Too much adrenaline before settling down for the night can make it really difficult to settle down.

From this, it would seem that it is highly possible that my brother has an addiction to video gaming. My mum think that is probably just a habit he enjoys and that he will grow out of it as he gets older. Let's hope this is the case...

Would a gaming addiction to a motion controlled game like Kinect be thought of as problem? If anything, surely it would just make the gamer in question extremely fit?