Animals have evolved to sleep in extreme ways — for example, taking micro naps during parenting, sleeping on the wing during migrations and dozing while diving.

Sleep is a universal biological state that allows all animals, from mammals to amphibians, fish and even insects, to restore ...

What has puzzled researchers and philosophers for many centuries is the ‘why’ of sleep, along with the ‘how’. We human animals know from experience that we need to sleep, and that the longer we go ...

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 may have evolved to help reduce DNA damage in nerve cells long before they became centralized in the brain, a study ...

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 ...

As every seasoned cat parent knows, cats sleep a lot. Chances are your furry feline is presently snoozing. Cats sleep so much that many new parents become concerned! However, in most cases, it is ...

The benefits of sleep may be more universal than we thought. We know it helps clear waste from the brain in humans, and now it seems that even creatures without brains like ours get similar benefits ...

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.