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 ...

Group sleeping can impact when animals sleep, how long they sleep for, and how deeply they sleep. For example, groups of meerkats time their sleep according to "sleep traditions"; olive baboons sleep ...

Group sleeping can impact when animals sleep, how long they sleep for, and how deeply they sleep. For example, groups of meerkats time their sleep according to “sleep traditions”; olive baboons sleep ...

Humans sleep less than every other primate on record, despite having the biggest brains — biologists call it the human sleep ...

Humans and other animals encounter and remember countless experiences each day; when we sleep, groups of cells in the brain known as neuronal ensembles replay these experiences to consolidate them ...

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 ...

Horses are well known for sleeping while standing, but this unusual habit is rooted in survival and anatomy. Their bodies are ...

Discover what happens when your dog sleeps in your bed, including bonding, comfort, habits, and the surprising facts every ...

You’ve probably heard about early birds and night owls. Both are references to sleep chronotypes, or the body’s natural inclination to be awake or asleep at certain times. “Your chronotype is driven ...