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Why Coffee Makes Some People Sleepy Instead Of Alert

Summary by studyfinds.com
You’ve probably heard sleepiness after coffee is blamed on dehydration, sugar or even unusual “reverse” caffeine chemistry.

4 Articles

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Coffee is known to keep you awake, but for some people, it actually makes you sleepy. Here's why.

Caffeine is not sedative. It is most likely that coffee is only temporarily hiding a fatigue that remains present. Although it is usually associated with increased alertness, coffee can cause somnolence in some people. The explanation, according to the scientific evidence analyzed by StudyFinds, will not be in a supposed capacity of caffeine to function as a sedative, but rather in the way the organism manages fatigue, substance tolerance and ef…

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Some people only need half a cup of coffee to feel alert, while others still feel sleepy even after a second or third cup. This difference isn't just about coffee-drinking habits; it's also related to how the body metabolizes caffeine, genetic factors, and the brain's adaptability.

·Ho Chi Minh City, Viet Nam
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studyfinds.com broke the news on Monday, September 21, 2026.
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