Why does coffee sometimes cause sleepiness

The article explores the secret behind the sleepiness some people feel after drinking coffee, despite their belief that it provides alertness and energy. It explains that caffeine temporarily blocks adenosine receptors in the brain, preventing feelings of fatigue for a brief period, but it does not stop the accumulation of adenosine, which causes sleepiness once its effects wear off after a few hours. This can lead to a sudden wave of fatigue, especially with repeated consumption, as the body becomes accustomed to caffeine and its effectiveness diminishes. Additionally, the timing of coffee intake—particularly immediately after waking—and the amount of sugar consumed are factors that influence feelings of drowsiness. Experts advise against relying on coffee as a substitute for sleep, recommending 7 to 8 hours of restful sleep, delaying the first cup of coffee by an hour to an hour and a half after waking, and reducing sugar intake and drinking water to avoid feelings of drowsiness after drinking coffee.

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