I just simply cant get more than 4-5 hrs of sleep every night, my obligations wont allow it. I do however eat right and exercise often so I am halfway there. So for me its Monster. The really bad one is I had this crazy stuff my friend brought back from the Philippines called Extra Joss. It was a powder you put in 8oz of water and it turned into a redbull on crack basically. So if I was really tired I would pour that INTO a redbull and voila! Caffeine Highball.