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 ...

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.

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 ...

Sleep is supposed to be the ultimate vulnerability. You shut down, your reactions slow, and the world keeps moving without you. For decades, sleep scientists have treated long, regular bouts of sleep ...

Scientists have long struggled to pinpoint a reason for why animals need sleep. They’ve put forward many hypotheses, including the need for metabolic repair, memory consolidation, and immune system ...

Sleeping for only a few minutes at a time? While this might sound like torture to humans, it's no problem for some animals. Their sleep patterns are hardly comparable to those of humans, yet they ...

If you liked this story, share it with other people. New research based on more than a decade of field observations indicates that wild Sumatran orangutans balance their sleep needs much like humans ...