Sleep is one of life’s most universal behaviors. Despite its ubiquity, it’s also one of the most mysterious. Humans spend about a third of their lives with their eyes closed and their brains in states ...

How does the brain clean itself during sleep? A new ultrafast MRI method tracks cerebrospinal fluid flow without contrast ...

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 ...

Jellyfish and sea anemones enter true sleep-like states despite lacking brains or centralized nervous systems. Sleep appears to protect neurons by limiting or repairing DNA damage caused during ...