hawkward, Astonishing X-Men colorist extraordinaire, pulls a lot of all nighters, probably more than I do. I was just recommending to her a little trick I pull when deadlines are looming and sleep is tugging on my sleeve... the caffeine power nap. Drink your favorite caffeinated beverage (a Sobe energy drink is my weapon of choice) then take a nap right away with an alarm set for 15 mins. When you wake, the caffeine should be kicking in and you'll much more refreshed than if you just had the drink. Your mileage may vary, but it works well for me.
Are you a power napper? What are your crunch time tricks?
I know you have some,
lx. 