It's not healthy, but a few days without sleep isn't going to seriously damage you. I mean, it IS true that lack of sleep can kill you, but you stay up long enough you'll fall asleep while running from the cops.

Anyway, short of busting some yay (impossible to sleep after a gram) or abusing various other stimulants, both licit and illicit...I'm sure there are plenty of OTC remedies that promote wakefulness. Go to your local vitamin store and ask around. 5 HTP comes to mind.

Good luck.