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

Jellyfish and sea anemones are curious creatures: these organisms evolved without a brain and, as scientists discovered only ...

Scientists already knew that the pair of shallow coastal ocean dwellers keep very different schedules of downtime: The ...

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

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

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 ...

It turns out sleeping isn’t just about resting your eyes, as a new study found that even ancient creatures without eyes — or even brains — need it too.

In jellyfish and sea anemones, neurons accumulate DNA damage while animals are awake and repair that damage during sleep.

The benefits of sleep may be more universal than we thought. We know it helps clear waste from the brain in humans, and now ...

With increased DNA damage from UV radiation or other reasons, the researchers also observed the jellyfish and sea anemones ...

Birds are aflutter with activity all day long so they certainly need to rest at night – but where do they go? Other than owls ...

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