Historic records show humans slept, woke, and slept again regularly before the Industrial Revolution. But was it really a universal habit, and does it have benefits? Though most modern societies sleep ...

Do you occasionally find yourself up in the middle of the night, ruminating and unable to go back to sleep? Or do you sometimes have a hard time falling sleep because you have too much on your mind?

Can knowledge of how our ancestors slept truly lead us to a life of more natural—and healthy —sleeping patterns? Authors on the Internet have been exploring that possibility, writing a spate of recent ...