I've found that for me, energy drinks don't necessarily eliminate tiredness, they just physically stop me from going to sleep, i.e. lie down to sleep and although tired just can't fall asleep.
They are odd... Most energy drinks don't do too much for me... I've tried a lot of them too... I took a five hour energy last week, and I seriously was ready to get into fights... EVERYTHING was making me angry, I was all kinds of jittery... I don't think i'll be taking one of those again. The most wired I've ever been from an energy drink was this crap called PowerTrip. We called it Power Twitch.
