Jellyfish sleep just like us, and even take midday naps

Jellyfish sleep just like us, and even take midday naps

Turns out jellyfish and sea anemones – among the ancient creatures with a nervous system instead of a brain – have a very similar sleeping routine to our own. A new study published in Nature Communications reveals that these animals not only sleep but do so for the same portion of their day as humans, spending about one-third of the day sleeping. The findings also suggest that sleep evolved long before the brain to help maintain cells under stre…