The worst thing that you can do to your wired head AND the most effective is liquid coffein. You should be able to get it from drug-store, they're selling it in ampullas AND if you're drink one of these with a glass of Coca-Cola... well, you can say bye-bye to sleep for at least 2 days streight. Fuck energy drinks - too much to piss
I know people that have worked on whisky and cocaine for 48 hours strieght, but it's another story...
Andrew