How did our ancestors sleep? Does it matter?
The adorable offspring have some very fascinating sleep habits.
Since they have to worry less about predators, primates who sleep in tree nests achieve more deep sleep — a trait crucial to development.
Looking back at the year's most important sleep discoveries.
Let's not be so hasty to blame the Industrial Revolution for our modern sleep habits.
Once early man came down from the trees and slept on the ground, they learned how to dream. And everything changed.
That feeling of falling right before dozing off is a harmless involuntary muscle spasm called a hypnic jerk.
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