His book At Day's Close: Night in Times Past, published four years later, unearths more than 500 references to a segmented sleeping pattern - in diaries, court records, medical books and literature, from Homer's Odyssey to an anthropological account of modern tribes in Nigeria.
Much like the experience of Wehr's subjects, these references describe a first sleep which began about two hours after dusk, followed by waking period of one or two hours and then a second sleep.
"It's not just the number of references - it is the way they refer to it, as if it was common knowledge," Ekirch says. [http://www.bbc.com/news/magazine-16964783]
How many people are shoving "medicines" down their throat for a problem that shouldn't be seen as a problem? And how much healthier would we all be (including shift workers, who have a notoriously difficult time switching between schedules) if we recognized our true nature?
Makes you wonder what else we might have wrong, doesn't it?