I've noticed that when I pull all nighters right before deadlines, and manage to get finished before code freeze, I have an overwhelming feeling of accomplishment and get so psyched that I spend the following workday much more productive than during regular (albeit generally laden with sleep debt) workdays.

But when the real accomplishment is missing and drowsiness creeps upon me, I take regular 5 minute walks at the corporate campus (a really nice green spot in the middle of the city), and have some 10-15 minutes powernaps. (I never drink coffee/cola)