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Re:Ask HN: I'm writing a book about white-collar drug use, i... by swsieber on Monday February 26, 2018 @11:54PM (#16471160)
If caffeine makes you tired, you probably have ADHD
Re:Ask HN: I'm writing a book about white-collar drug use, i... by grzm on Tuesday February 27, 2018 @12:15AM (#16471240)
Caffeine is known to make people sleepy as well. See the comments in this thread regarding "espresso naps". I can attest to their efficacy.

https://news.ycombinator.com/item?id=16470592

Re:Ask HN: I'm writing a book about white-collar drug use, i... by swsieber on Tuesday February 27, 2018 @10:06AM (#16473910)
Yeah, I should have phrased that differently:

ADHD people don't benefit from the "energizing" properties of caffeine.