1) Is this normal behavior for the slightly above-average gamer? Yes. It's not weird at all if you go play poker at a friend's all night, so why should Runescape be? 2) When does this start to become a problem? When you do it so often that it has a long-term effect on your other activities (getting fired, dropping out, getting dumped, etc) 3) What's the worst example of this you yourself have done? I'm not a very serious gamer. I guess the worst would be Runescaping from 8 am to 12 am one day last summer when my parents were out.