January 21, 2021

Which came first, sleep or the brain?

In work that could help unravel the origin of sleep, an international team of researchers has shown that tiny, water-dwelling hydras not only show signs of a sleep-like state despite lacking central nervous systems but also respond to molecules associated with sleep in more evolved animals. The new results suggest that many sleep-related mechanisms developed before the brain and may have been conserved during the evolution of central nervous systems.

 Sleep Disorders News — ScienceDaily

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