Concerta and Ritalin will also do the trick, but as someone else has already mentioned all are very addictive. All are the equivilent of pharma meth, so you must ask yourself is it really worth it.
I've had coffee, soda, no doz, red bull etc.. and gone to sleep an hour later.
The only time I felt any affect from coffee or tea was drinking an entire pot of iced tea with 1 cup sugar. I believe it was more dehydration/sugar than the caffeine though! Pretty insane.
I have a damn fast metabolism though. Same weight approx. (1-2lbs) for over 6 years.