Seriously, other energy drinks like monster, rockstar, all those crappy ones, I drink one and an hour later I'm tired as ever. The other one's I listed I'll be good for about 2 or 3 hours. But a SPIKE, I'll be up for hours! Even drinking one at like 6 in the evening, I have trouble falling asleep. If I do, I'll wake up all through the night and be WIDE awake!