When I have to pull an all-nighter, I just allow extra calories. The max I would allow myself would be the maintenance amount for my current weight. You actually burn more calories if you're awake, even if you're just sitting and studying, than you do when you're asleep, so it's not as bad as it seems.
Homework often keeps me up all night. I don't always 'need' to eat during the night when I do this, but the following day my will power is low. I read somewhere that being sleep deprived makes your body crave carbs as a quick source of energy.
So what do you guys do on days like this? How do you prevent yourself from completely blowing your diet?
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