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Even Though They Don't Have Brains, Jellyfish and Sea Anemones Sleep Like Humans

Summary by Smithsonian Mag
Sleep may have evolved to help reduce DNA damage in nerve cells long before they became centralized in the brain, a study suggests

3 Articles

If Lior Appelbaum now says that even the jellyfish dares slumber, then there is a quiet question floating in the sea that no researcher's clock can beat: whether in the quiet, soft light that breaks through the water layers, an image emerges, so tender, so round that it only dreams in the sea floor. Perhaps a flickering without form, a warm stream of quiet norm, an up-and-down, which...

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Scientific American broke the news in on Thursday, January 8, 2026.
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