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How Much Caffeine Is Too Much
Most people know caffeine affects sleep. Far fewer know it can still be working eight hours after the last cup, or that two people drinking the same coffee at the same time can be carrying very different amounts by bedtime. This four-page reference covers what caffeine actually does in the brain, how much is in what you drink, and where the real risks lie. Written for the person who wants to make an informed decision, not follow a one-size-fits-all limit.
