[thenoblesunfish]

Great advice about caffeine. My personal limit is one cup a day, first thing in the morning. More than that has very noticeable effects on me - positive in the short term but negative in the long term. Don't listen to what other people tell you about it, and do the experiments on yourself. Like most drugs, people seem to like brag about being able to handle it, and like most drugs, it has wildly varying effects on different people.