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•January 31, 2026

What an ancient jellyfish can teach us about the evolution of sleep

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Jellyfish sleep like humans — even though they don’t have brains

Jellyfish sleep like humans — even though they don’t have brains

Studying ancient sea creatures’ snoozing habits could shed light on the origins of sleep. Studying ancient sea creatures’ snoozing habits could shed light on the origins of sleep.

Jellyfish sleep like humans — even though they don’t have brains. The findings bolster a theory that sleep evolved, at least in part, to protect the DNA in individual nerve cells, helping to repair damage that builds up while animals are awake.

Jellyfish sleep like humans — even though they don’t have brains. The findings bolster a theory that sleep evolved, at least in part, to protect the DNA in individual nerve cells, helping to repair damage that builds up while animals are awake.

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Jellyfish sleep like humans — even though they don’t have brains. The findings bolster a theory that sleep evolved, at least in part, to protect the DNA in individual nerve cells, helping to repair damage that builds up while animals are awake.

We’re committed to safety and security. But not for bots. Complete the challenge below and let us know you’re a real person.