The truth about videogame addiction

TechRadar writes: Have you ever succumbed to temptation and had "just one more go?" Do you find yourself playing games and then later realising you had other things you should have been doing? Like sleeping, to take an example entirely at random…

Almost all gamers will have tasted that peculiar guilty feeling of having played one hour or level too many at some point. The question is: when does it become a problem?