This is read by an automated voice. Please report any issues or inconsistencies here. Animals such as penguins and frigatebirds have evolved extreme sleep strategies — naps that last a few seconds, ...

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 ...

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 ...

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 ...

While sleep is a crucial component of survival for all living organisms, some animals take the concept of sleep to an extreme level. Ranging from tree-dwelling animals to nocturnal predators, the long ...