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Deep sleep: Even jellyfish need their slumber
by Will Dunham

Reuters    Translate This Article
21 September 2017

On 21 September 2017 Reuters reported: Even a jellyfish -- one of Earth's first and most ancient animals -- needs its sleep. Scientists said on Thursday (21 September) they have demonstrated that a primitive type of jellyfish called Cassiopea goes to sleep nightly. While sleep has been confirmed in other invertebrates such as worms and fruit flies, the jellyfish is the most evolutionarily ancient animal that has been shown to slumber. The findings involving such a primordial creature raise fresh questions about sleep's origin and purpose. Global Good News service views this news as a sign of rising positivity in the field of science, documenting the growth of life-supporting, evolutionary trends.

Jellyfish have thrived in the seas for at least 600 million years, longer than nearly any other animal. ...

'We do not know if sleep is limited to just animals,' said California Institute of Technology biologist Ravi Nath, who helped lead the study published in the journal Current Biology.

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