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