How Does Caffeine Work as a Stimulant?

Caffeine is a widely used stimulant found in various foods and drinks. It works by blocking adenosine in the brain, leading to increased alertness and heart rate. Caffeine affects sleep by extending sleep latency and reducing total sleep time. The amount of caffeine in foods varies, with coffee being a major source. Negative effects include insomnia, anxiety, and gastrointestinal issues. Caffeine's half-life varies, influenced by factors like medications and health conditions. Experts suggest limiting caffeine intake in the afternoon to avoid sleep disturbances.

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