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Even jellyfish get sluggish if they don’t have enough sleep [New Scientist]

par Frédéric Magné - publié le

Birds do it, bees do it, even enervated fleas do it. Sleep is widely believed to be common to all animals with a central nervous system, but it turns out to be even more ubiquitous than that.
Jellyfish have been found to enter a sleep-like state at night, and become dozy the next day if their rest is interrupted. This is remarkable for an animal with a simple, diffuse nervous system and no centralised brain.

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