These jellyfish don’t have brains, but still somehow seem to sleep


Ask a college student, infant, or anyone over the age of 23 if they like sleep, and they will likely tell you: sleep is good. But it turns out that sleep is so good, it might not even take a brain to do it.

Take the upside-down jellyfish: known by the scientific name Cassiopea, these jellyfish don’t have brains. They don’t swim around much, and can usually be found resting on the floor of shallow, warm bodies of water with their bells down on the floor, gently pulsing. But all that rest is not created equal, according to research published today in the journal Current Biology.

http://www.popsci.com/upside-down-je...ut-still-sleep