been having 3 in the morning the past 2 weeks (keep me alert in exams). but now its over... i dunno. think the coffee boost is mostly placebo, unless you have a LOT of concentrated stuff... ie, when i had ~3 cups of coffee worth of "wet coffee grains" with no water really, i was really really "jittery", bare in mind it was about 4 or 5 am, and i couldnt breathe thought i might die :X... had to go outside in the cool air and drink from the outside tap haha. was fun 