Why Does Coffee Make You Sleepy?

Coffee can make you feel sleepy due to a buildup of adenosine, a chemical that promotes sleep. Caffeine blocks adenosine receptors to keep you alert, but the body continues to produce adenosine. Once the caffeine wears off, a sudden rush of adenosine binds to the receptors, causing a sugar and caffeine crash. Dehydration and high sugar content in traditional kopi can also increase drowsiness. Source: HealthHub Singapore

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