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I think all nighters are bad idea, because my college mates who done them had ... less then smart answers to even simple questions.

They were smart, as people. But not sleeping whole night makes you dumb. And they inability to figure what was not memorized harmed their performance a lot.

Yeah this would make sense. I still do think all nighters would probably harm your memory retention even if you do it a couple days before the exam. I'd imagine the brain has more time to really process what you're studying if you sleep after doing so.

I always felt worse two days after all nighters than the day after. I feel like the next day isn't necessarily when you pay, once the morning comes around again you get a second wind