why would a well rested person still have a caffeine crash after drinking coffee

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I get caffeine masks being tired but if you have no reason to be tired why would you be tired after wards?

In: 6

“Caffeine blocks adenosine in your brain, which is what your brain produces when you’re tired. But when you’re drinking coffee, your brain doesn’t stop producing adenosine. So when the caffeine wears off, adenosine floods your brain’s receptors, making you tired and ready for bed.”

Sorry for the quotations but I am bad at ELI5 lol