Sleep is usually associated with complex animals with brains and nervous systems, but new research suggests it may be far older, and far more basic, than previously thought.

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 ...

Researchers report sleep-like states in brainless marine animals, suggesting rest began as a basic cellular repair mechanism.

An upside-down jellyfish drifts gently in a shallow lagoon. At first glance, it looks like it’s just floating, but scientists have discovered something qui ...

An upside-down jellyfish drifts in a shallow lagoon, rhythmically contracting its translucent bell. By night that beat drops ...

Turns out jellyfish and sea anemones – among the ancient creatures with a nervous system instead of a brain – have a very similar sleeping routine to our own. A new study published in Nature ...

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.

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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 ...

What do humans have in common with jellyfish and sea anemones? You might be thinking, not a lot, but a new study published in Nature Communications shows they do sleep like us and that sleep has a big ...