Comment by randallsquared

I dunno. Caffeine doesn't affect me very much (I mean to say, I can drink regular coffee and go to sleep an hour later without difficulty), though it is somewhat pleasant. I used to regularly detox from caffeine to get that initial rush again, and that would mean 3-4 days of mild headache, and another few days of fuzzy-headedness, and then things were normal again. I'm aware, though, that some people can't have coffee or cola after early afternoon if they want to sleep well, so. Various people have quite different responsiveness to caffeine.