Wild nights : how taming sleep created our restless world

"Humans have slept since the dawn of our species. And yet the way humans sleep across history has changed dramatically, most disastrously in our own modern era. For the last two centuries sleep, the industrialized West has reduced sleep to one narrow definition: hours of unbroken slumber, in a private chamber, alone or with at most one additional partner. And this artificial cultural definition is now spreading around the world. We've gained much...