@noiob because coffee doesn't give energy, it blocks tiredness chemicals to be processed in brain. but they are still there and growing in count, so when the coffee effect wears off, they will attack you and give you a tiredness wave
@northern_dude I just drank it. Also I know how caffeine works, I just have atypical responses to stimulants
@northern_dude caffeine content can vary wildly based on extraction technique, grind settings and the kind of roast you're using