Scientists don’t entirely agree about why we sleep, although it seems to be a time of rejuvenation for the brain. If that’s the primary reason, you might think animals who don’t have a brain don’t need sleep. But a new study shows that jellyfish—which has a ring-shaped nervous system instead of a brain—sleep, too.

Dive into this subject with “You don’t need a brain to sleep. Just ask jellyfish” from Science Mag

雖然睡眠看似是大腦恢復精力的時段,但不是所有科學家都同意這是我們要睡眠的原因。如果這真是睡眠的主要原因,那麽沒有大腦的動物就不需要睡眠了。然而,最近一個研究發現,水母只有一個環形神經系統,沒有大腦,但它們也會睡眠。

要多了解此研究結果,可參看Science Mag 科學雜誌:

http://www.sciencemag.org/news/2017/09/you-don-t-need-brain-sleep-just-ask-jellyfish