📝Caffeine

Caffeine works by blocking the effects of a neurotransmitter called adenosine, which builds up over the course of the day and makes you feel tired.
That means, the best time to drink coffee is before you are tired.
If you got tired, the good way to refreshen is to drink a cup of coffee and take a nap. Nap will drop adenosine off, so that caffeine can take its place (to block receptors).
Espresso has more caffeine per ml than brewed coffee, but you only get a 30 ml in a shot, so actual caffeine intake is smaller.
Green tea contains less caffeine than coffee. But, “green tea also contains the amino acid L-theanine, which has been shown to work synergistically with caffeine. Thus, you get a milder but different kind of buzz than with coffee, despite the lower caffeine content of green tea. In particular, the combination of L-theanine and caffeine has been shown to help improve both alertness and focus, which may make green tea a better drink than coffee if you’re doing tasks that require a lot of thought.”
Knapp & Zeratsky₂₀₁₈ has a good section on coffee.
Caffeine has a half-dissolve period of 6 hours (?). Don’t drink coffee before Sleep.

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