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 presents a serious challenge for animals that still need oxygen to survive. Different species have ...

Some animals appear lazy at first glance, spending large portions of the day asleep or resting. In reality, frequent naps often serve an important purpose. For many species, sleeping helps conserve ...

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 ...

Sleep is important for everyone, but some animals take it to a whole new level. While humans usually need around seven to ...

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.

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.

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 ...