Cautionary tales in science fiction are warning us about turning sleep into a commodity. Here's why some of those fears ...

The genre of science fiction has a lot to say about sleep. Here are 11 great stories, from TV, film and books.

On dry nights, the San hunter-gatherers of Namibia often sleep under the stars. They have no electric lights or new Netflix releases keeping them awake. Yet when they rise in the morning, they haven’t ...