Studying ancient sea creatures’ snoozing habits could shed light on the origins of sleep.

A new study from Bar-Ilan University shows that one of sleep's core functions originated hundreds of millions of years ago in ...

This is the moment deep sea explorers captured an incredibly elusive creature on camera - the giant phantom jellyfish.

Every animal with a brain needs sleep — and even a few without a brain do, too. Humans sleep, birds sleep, whales sleep and even jellyfish sleep.

Some places just have an unfair advantage. They hog all the good weather, collect stunning landscapes like they’re trading ...

Helicopter damselflies specialize in preying on web-building spiders, like the little orb weavers. This predatory flyer is ...