We used to have a few productive hours in the middle of the night, but that all went away during the Industrial Revolution.

For much of early modern Europe, sleep didn’t seem to have followed the single, unbroken pattern we use today. A large body of historical evidence points to many people sleeping in two stretches, with ...

Imagine if we asked you to go into the countryside for an extended period of time and the only requirement was that at night you had to sleep in a tree. You would be free to roam about and to forage ...

A new study analyzed the sleep patterns of jellyfish and sea anemones and found they share some sleep traits with humans. The research could provide insight into the origins and function of sleep.