Humans used to have a ‘first sleep’ and ‘second sleep’ at night. Here’s why that changed.

We used to have a few productive hours in the middle of the night, but that all went away during the Industrial Revolution.
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The long, weird history of people sleeping in two shifts

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 ...
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Did the modern world kill this human sleep habit?

When it comes to the sciences, the study of sleep is remarkably young. Rigorous studies of sleep and sleep patterns only emerged in the 19th century. To study sleep patterns before then, one has to ...
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In 1963 Randy Gardner Flipped A Coin And Became The Most Sleep-Deprived Person In History

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...