Engery drinks along with coffee or any caffeine driven beverage for that matter doesn't do shit for me, but I drink it anyways. I never drink coffee, but you'll catch me drinking a Red Bull here and there just because it's a beverage when I'm thirsty. The only effects I get from drinking enery drinks is that I sleep like shit that night. Then again, when you're drinking one or two Red Bulls at 2 in the morning after doing whatever activity such as smoking...you can't expect to sleep easily.