Anthropologist and author David Samson examines how the story of human sleep unfolded in his new book, “The Sleepless Ape.” ...

An upside-down jellyfish drifts in a shallow lagoon, rhythmically contracting its translucent bell. By night that beat drops from roughly 36 pulses a minute to nearer 30, and the animal slips into a ...

Humans aren’t the only creatures that need to snooze. A peer-reviewed study by Bar-Ilan University researchers shows that sleep is an ancient process, dating back through evolutionary history, and an ...