How Three Friends Proved That Jellyfish Can Sleep
By STEPH YIN
SEPT. 21, 2017
The New York Times
Worms and fish do it. Birds and bees do it. But do jellyfish fall asleep?
It seems like a simple question, but answering it required a multistep investigation by a trio of Caltech graduate students. Their answer, published Thursday in Current Biology, is that at least one group of jellyfish called Cassiopea, or the upside-down jellyfish, does snooze.
The finding is the first documented example of sleep in an animal with a diffuse nerve net, a system of neurons that are spread throughout an organism and not organized around a brain. It challenges the common notion that sleep requires a brain. It also suggests sleep could be an ancient behavior because the group that includes jellyfish branched off from the last common ancestor of most living animals early on in evolution.
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1. Field Guide to the Neighborhood Birds of New York City by Leslie Day
2.Heartbeats in the Muck by John Waldman
3. The Fisheries of Raritan Bay by Clyde L. MacKenzie Jr.
4. Waterfront: A Walk Around Manhattan by Phillip Lopate
5. The Bottom of the Harbor by Joseph Mitchell