spaceships:

Myth #1. Humans Need Eight Hours Sleep a Night

There are many ways of sleeping and few cultures sleep in eight-hour consolidated blocks like we do. In places like Bali and New Guinea, people tend to slip in and out of sleep as they need it, napping more during the day, and getting up more at night. Until the industrial era, many Western Europeans divided the night into “the first sleep” and the “second sleep.” They’d go to bed soon after dark, sleep for four hours then wake for an hour or two during which they’d write, pray, smoke, reflect on dreams they’d had, have sex or even visit neighbors. In fact, there’s some evidence to suggest that this sleep pattern may be the one most in tune with our inherent circadian rhythms.

So awesome.