A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it's not like human sleep. Giordano Cipriani/The Image Bank via Getty Images From the goldfish in your ...

A protective mucous cocoon surrounds this parrotfish as it sleeps in Australia's Great Barrier Reef. This layer of protection helps fend off predators so parrotfish can get a good night's rest.

A video captured by an underwater robot has scientists scratching their heads. The video, which was captured in Beagle Marine Park in Australia, shows thousands of female sharks sleeping on the ...

Sleepy Baby’s Shark Tank pitch impressed Kendra Scott, securing $$70,000 for 50% equity after a demo of their patting sleep ...

Thousands of schloofing sharks were spotted in an underwater sleepover party off the coast of Australia. The shiver consisted of Port Jackson sharks, a species that inhabits Australia’s southern ...

Michael Heithaus does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

Sleep in fish may look different from humans, but rest is essential for survival. Here’s what experts have to say about fish sleep. A protective mucous cocoon surrounds this parrotfish as it sleeps in ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. Could you explain how fish sleep? Do they drift ...