Caffeine, the World’s Most Popular Psychoactive Drug:

The power of caffeine to keep us awake and alert, to stem the natural tide of exhaustion, freed us from the circadian rhythms of our biology and so, along with the advent of artificial light, opened the frontier of night to the possibilities of work.

Small takeaway on a part of Michal Pollen’s new book This is Your Mind on Plants which I’ll need to find a copy of at some point…