It's a melatonin type hangover. Your body produces it to help you get to sleep, but if you are pulling an all-nighter, your body doesn't stop porducing it, it produces MORE.
The more you deprive yourself of sleep, the worse the effect will be, until to either collapse in a heap from exhaustion, or you die.
Remember that you NEED sleep. Sure, catnaps help in some situations, but you NEED serious REM sleep or risk suffering a serious psycho-meltdown. Hallucinations, paranoia and system failures are some of the results of lack of sleep. (Of course I'm talking more than a couple days worth, but you get the picture.)
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