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If you’ve ever seen a jellyfish in the wild, at an aquarium, or in one of those 11-minute-long relaxation videos on YouTube, you’ve probably wondered: What are jellyfish trying to do? What is their ...

Sleep is a fundamental part of life for many organisms on Earth, and new research suggests that even jellyfish require a few Z's—a discovery that sheds light on just how old and widespread the ...

Sleep is sp essential that you and I can’t live without it, and many other animal species are the same way. On the other hand, scientists have long thought that for sleep to be needed, said organism ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. They don't have brains, or even anything more than a rudimentary nervous system, but jellyfish ...

The life of a jellyfish may seem like a real snooze, but until now biologists were never certain if the gelatinous blobs actually slept. Now it appears that at least one group of jellyfish needs its ...

Tim Cook famously cuts his beauty rest short by waking up at 3:45 a.m., but even the overachieving Apple CEOs among us need to sleep eventually. It’s in our genes — and, as Caltech scientists reported ...

A primitive type of jellyfish called Cassiopea, which goes to sleep nightly, is seen on the floor of their tank at Caltech in Pasadena, California, U.S. in this image released on September 20, 2017.

New research suggests that Cassiopea jellyfish eschew the night life, tucking into bed and going to sleep when the sun goes down. Credit: Karen Doody Getty Images The purpose and evolutionary origins ...

The purpose and evolutionary origins of sleep are among the biggest mysteries in neuroscience. Every complex animal, from the humblest fruit fly to the largest blue whale, sleeps—yet scientists can’t ...