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Researchers of a new study recently identified a state akin to sleep in a tiny, freshwater animal, also known as hydra, which has simple anatomy and doesn t have a brain.
Such a finding, as reported by Live Science, appears to oppose the common knowledge that the brain needs sleep to function properly. It turns out, based on what the researchers discovered, one does not require a brain to sleep.
According to Japan-based Kyushu University assistant professor Taichi Itoh, they currently have strong evidence that animals must have acquired the necessity to sleep before they acquired a brain.
The said research, which Science Advances recently published, has consequences for understanding the reason for the necessity for sleep evolved. ....

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