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.

Researchers in Oklahoma have discovered that floating alligators keep half their brain awake as they sleep. Karen Parker/FWC photo As if alligators weren’t intimidating enough, experts have discovered ...

Unlike humans, whales and dolphins have evolved a fascinating way to sleep without drowning. They utilize unihemispheric sleep, keeping one half of their brain active while the other rests. This ...

Some birds stay aloft for astonishing lengths of time, using clever sleep habits to survive long flights. These remarkable species show how migration can push creatures to extraordinary limits.

If you need a moment or two of Zen in your crazy day, this video that World Wildlife Fund (WWF) shared of a pod of bottlenose dolphins swimming in clear blue water is it! The video was shared at the ...

As if alligators weren’t intimidating enough, experts have discovered the predators practice a form of sleep that keeps one half of their brain awake at all times. The discovery was made the hard way ...