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

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.

Sleep may have evolved to help reduce DNA damage in nerve cells long before they became centralized in the brain, a study ...

Some animals can sleep with just half their brain at a time. Understanding this phenomenon can help us learn more about human ...

In jellyfish and sea anemones, neurons accumulate DNA damage while animals are awake and repair that damage during sleep.

Have you ever been so exhausted that you feel basically half-asleep? Turns out, that may be what’s literally going on in your brain, according to a new study published in Nature. In a study of rats, ...

Each night, our brains cycle through hours of activity that remain surprisingly mysterious. Even though much of that time is spent dreaming, scientists still don't fully understand what the brain is ...