When animals nod off, they're most vulnerable to sneaky predators. But despite the risks, the need for sleep is so strong ...

Dominant baboons sleep less at night, as social rank keeps leaders more alert and prone to nighttime disruptions.

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 ...

When animals sleep, they're most vulnerable to predators. But despite the risks, the need for sleep is so strong that no creature can skip it altogether, even when it's highly inconvenient.

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 ...

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 ...

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.

Turtles can slow their hearts down to sleep underwater. Some species of turtles can even breath through their butts!

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 ...