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 ...

Sleeping underwater might sound peaceful — but for ocean animals, it’s a matter of survival. Some dolphins sleep with one half of their brain at a time, keeping one eye open to avoid danger and ...

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 ...

Sleep is a complex beast, which is a big reason why researchers are still pinning down the many ways in which pets help us slumber better. But there's no denying that our sleep stands to improve when ...

Humans do very little when we sleep. This might not seem like a big deal, until you look to the dolphins as they sleep and swim with the pod. Or fur seals, who can sleep while watching out for sharks.

Tired of ads? Subscribers enjoy a distraction-free reading experience. Every animal with a brain needs sleep — and even a few without a brain do, too. Humans sleep, birds sleep, whales sleep, and even ...