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Brewing timer

Longer steeping usually brings more caffeine. Pick a time and start.

Ranges are shown because studies report different numbers. General information, not medical advice. Sources and method

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Health and sleep

Caffeine and Sleep: What the Research Shows

How much caffeine shortens sleep and delays falling asleep: numbers from two meta-analyses (22 and 24 studies), the role of dose and timing, and the limits of the research.

26 October 20264 min read