Unlike humans, whales and dolphins have evolved a fascinating way to sleep without drowning. They utilize unihemispheric sleep, keeping one half of their brain active while the other rests.

The video starts with the dolphin tossing a football to a man standing on a dock. He tosses it back to the dolphin - who ...

How much longer they could have continued was not studied. Sleeping with only one half of the brain at a time, or unihemispheric sleep, was believed to have evolved in dolphins to enable them to ...

One of the most fascinating things I've learned about them since I started writing about pets and animals has to do with how they sleep. Dolphins experience what is called "unihemispheric sleep ...