Can we solve the mystery of sleep by unearthing the history of coffee?

By Grace Davis

People are under a lot of stress. They’re sleeping during the daytime. They’re awake during the nighttime. They’re drinking three cups of coffee after 4:00 in the afternoon. (I myself am guilty of this vice). They can’t function in their early morning meetings or classes without at least two shots of espresso. How did we get here?