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Scientists just discovered the first animal (the upside-down jellyfish Cassiopea) without a brain that sleeps. The results suggest that sleep is deeply rooted in our biology, a behavior that evolved early in the history of animal life and has stuck with us ever since.
Scientists just discovered the first animal (the upside-down jellyfish Cassiopea) without a brain that sleeps. The results suggest that sleep is deeply rooted in our biology, a behavior that evolved early in the history of animal life and has stuck with us ever since.
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