Going to try and pull an all-nighter, any tips??

I *wouldn't* recommend caffeine because of the crash. I'd try the cold/warm thing, though. Just do the best you can to focus; reading at 5 a.m. probably isn't any good at all since you won't retain any info. If necessary, even try cliff notes online or something, but try not to deprive yourself of sleep over something you won't remember the next day.