Oblivion (and me)
I've been playing, almost constantly, Oblivion (The Elder Scrolls 4), A Role-playing fantasy game. I never did get into the previous Elder Scrolls games, although I maybe should have, as a bunch of friends played it.. Byron got me into this game as we talked about it at a bar downtown. What clinched it for me was that his character got biten by a vampire and he turned into one permanently. The open-endedness of the game is nearly limitless!
I've gone to bed between 2:20am -> 3:30am no earlier than 2:20am since Sunday. (Keeping in mind my average bedtime is 1am).