Nature
•January 6, 2026Jellyfish sleep like humans — even though they don’t have brains
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Phys.org - latest science and technology news storiesSleep is essential for much of the animal kingdom. During the night, neuron and tissue repair mechanisms are activated to aid recovery from daily activity. This is risky: organisms that sleep are more vulnerable to predators. However, the phenomenon extends from mammals to invertebrates. Nevertheless, until now it was not known whether other, more ancient groups without neurons, such as corals, engage in any kind of nocturnal rest.
The Times of IsraelBar-Ilan University study shows that even jellyfish and sea anemones repair DNA during repose, underscoring the fact that a good snooze is an essential evolutionary tool for health