I wouldn\'t leave it on for a night also because when you wake up in the morning and want to play some games the PS2 is already hot because of all the work it has done over the night.
Then you play a game, for ex. SSX; you\'re getting the score of your life and leading the race by far in the finals just about to unlock Untracked; you\'ve made that far by luck and then all of a sudden the game freezes.
This has happened to me. I left PS2 over night by accident then I played Rayman Revolution and it froze. Gladly I didn\'t lose anything but it did annoy me and scare me at first.
I don\'t know was the freeze about the game itself or the console, but I quess it\'s the console. So I could be one hundred prosent sure it isn\'t about the console I won\'t leave it on for night ever from this day on