A few years ago, it dawned on Zach Thomas that coffee didn't have enough caffeine. At the time, he was pulling all-nighters as a student at the United States Military Academy at West Point. By the time he became an instructor at the U.S. Army Ranger School in Fort Benning, Ga., he lived by a common saying at his school: "Sleep is a crutch." "I used to just drink a pot of coffee, but then you have to go to the bathroom 100 times during the day. If you could just get more caffeine in one cup, then Join discussion...