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flag Jellyfish and sea anemones, despite having no brains, exhibit sleep-like states that protect neural health, a study finds.

flag Jellyfish and sea anemones, despite lacking brains, display sleep-like behavior with patterns similar to humans, according to a study in Nature Communications. flag The upside-down jellyfish Cassiopea andromeda sleeps about eight hours daily, mostly at night with a midday nap, while the starlet sea anemone Nematostella vectensis sleeps roughly one-third of the day, mainly at dawn. flag Researchers observed reduced movement and slower responses during sleep, with sleep deprivation leading to compensatory rest. flag DNA damage in neurons increased during wakefulness and decreased during sleep, suggesting sleep’s core function is protecting neural health. flag These findings support the theory that sleep evolved early to maintain cellular integrity, even in animals without complex nervous systems.

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