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

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 ...

We humans may need our eight hours of sleep a night to keep our brains functioning, but that's not the only duration, or reason, why animals sleep. Bats sleep for 20 hours out of the day while ...

House cats sleep a lot. Wild elephants, way less. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Though constantly studied, sleep is one of the ...

Jellyfish and anemones sleep to repair neuronal DNA damage Jellyfish and sea anemones extend sleep when neuronal DNA is ...

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

This article originally appeared in Knowable Magazine. Young jumping spiders dangle by a thread through the night, in a box, in a lab. Every so often, their legs curl and their spinnerets twitch — and ...

Nodding off Is Dangerous. Some Animals Have Evolved Extreme Ways to Sleep in Precarious Environments Every animal with a brain needs sleep — and even a few without a brain do, too. Humans sleep, birds ...