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taw comments on Coffee: When it helps, when it hurts - Less Wrong
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In the paragraph before that, you said you didn't trust neurochemistry to explain how drugs work. Why do you then accept amphetamine's mechanism of action (or at least accept that it differs from modafinil's), but not caffeine's?
And I'm pretty sure caffeine makes people less sleepy. It's not as powerful as modafinil or amphetamines, but it's effective.
Caffeine might increase energy levels, and do other things, but it is ridiculously inaccurate to say "caffeine makes you less sleepy" as its main effect. Try modafinil/caffeine double blind test - modafinil is not "stronger caffeine", it's completely different, by actually reducing sleepiness without any energy boost. Amphetamines are even more complicates.