MSNBC attempts to break through the preconceptions, assumptions, hearsay and misinformation on a whole range of health issues, and is somewhat realistic about how inconclusive the effects of caffeine are. That said, some effects are without question, as the quote below highlights.
Why does caffeine make me sleepy?
Coffee is traditionally thought of as a pick-me-up, but many people find that it can actually make them feel tired. Caffeine seems to affect people in different ways, but overall there are 3 main reasons this happens.