Energy Drinks Thread

I haven't like shopped around or anything, but all the experiences I've had with energy drinks have resulted in surprisingly little energy afforded to me, by the drink. It's the same with sugar, it makes me sleepy but I am to understand that most people experience a burst of energy before that happens to them. I drink coffee in the mornings, because it's supposed to help you feel awake, but I couldn't say for sure whether or not that's actually happening for me. Apparently I have some kind of "crazy metabolism."