Study of brainless hydra suggests sleep evolved before the central nervous system
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Summary
Researchers from Kyushu University studied Hydra vulgaris, a cnidarian without a central nervous system, to investigate the evolutionary origin of sleep. They found strong evidence that sleep behavior predates the evolution of brains, suggesting the need for sleep arose earlier than previously thought in evolutionary history.
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Key quotes
· 1 pulledAccording to Taichi Q. Itoh, one of the researchers, there is now strong evidence that the need for sleep came before the acquisition of an actual brain.
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