Why is it that sometimes when you take caffeine that only your heart beats faster but your mind stays tired (or becomes even more tired)?

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Why is it that sometimes when you take caffeine that only your heart beats faster but your mind stays tired (or becomes even more tired)?

In: Biology

I guess it’s only a temporary central nervous system stimulant and it can’t really replace lost sleep. It might temporarily give your body a boost but if you’ve only had two hours sleep then you’re probably gonna be tired no matter what. Plus, you’re probably gonna crash hard after the initial surge. It’s not a miracle worker 😛

I’m no neuroscientist but I think it has to do with caffeine being sometimes producing adrenaline instead of dopamine

Caffeine doe not make you more awake, it helps prevent you from becoming tired. The sugar is what “wakes” you up. The “shape” of the caffeine molecule is the same shape as the receptor that recognizes you are sleepy. Square block goes in square hole. Except both caffeine and the “sleepy” molecule are the same shape “square”. So it fills that square hole before the sleep one will until it wears off.