Some animals can sleep with just half their brain at a time. Understanding this phenomenon can help us learn more about human ...

Ever wondered how some animals manage to survive without the luxury of a good night's rest while we humans desperately need our eight hours? The animal kingdom is packed with creatures that seem to ...

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. Sleep is universal “even though it’s actually very ...

The animal kingdom is full of fascinating adaptations, and one of the most intriguing is the ability to sleep with one eye open. While humans drift into deep slumber with both eyes closed, several ...

Most animals don’t keep the same schedule we do. While we try to squeeze in eight hours and call it a good night, many animals snooze through more than half the day—and some barely stay awake at all.