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南陽・東置賜V9へ盤石 県縦断駅伝、あすから2年ぶり熱戦

南陽・東置賜V9へ盤石 県縦断駅伝、あすから2年ぶり熱戦
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Ideas, Inventions And Innovations : Which Came First, Sleep or the Brain?

Ideas, Inventions And Innovations Which Came First, Sleep or the Brain? Stay awake too long, and thinking straight can become extremely difficult. Thankfully, a few winks of sleep is often enough to get our brains functioning up to speed again. But just when and why did animals start to require sleep? And is having a brain even a prerequisite? In a study that could help to understand the evolutional origin of sleep in animals, 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.

Which came first, sleep or the brain?

In work that could help unravel the origin of sleep, an international team of researchers led by Kyushu University 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.

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