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flag Jellyfish and sea anemones show sleep-like states, revealing sleep evolved earlier than believed.

flag A new study shows jellyfish and sea anemones exhibit sleep-like behaviors, including reduced activity and decreased responsiveness, suggesting sleep evolved much earlier in animal history than thought. flag Despite lacking brains, these simple creatures display rest phases essential for well-being, hinting at a fundamental biological purpose for sleep shared across species. flag The findings may help scientists understand sleep’s role in brain function and lead to better treatments for human sleep disorders.

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