The problem with turn-based games
is that you're always taking "just one more turn" and the next thing you know it's midnight.
The latest game that's distorting my sense of time is Age of Empires: The Age of Kings
for the Nintendo DS. In order to get the popular PC game into the DS, some adjustments had to be made. Most notably, moves don't take place in real time, but are processed in turns, much like they would in a traditional board game. You're still building castles and towns and using research to advance your primitive forces from one age to the next. If you're a fan of the original Age of Empires, you'll be settling into this game in no time.
I'd say more, but I've got an Emperor to squash...