Expanding on the sleep thing:

I thought it was an old wives' tale/not applicable to me. But when I actually tried the experiment, documenting how I felt on 4 hours of sleep vs. 8 hours of sleep, I realized that I was happier and more intelligent when rested, and that I understood lectures much better when I didn't doze off! If you doubt that this is applicable to you, try the experiment.

I never actually needed all-nighters to finish my work. If you space out your studying it's never necessary.