How do Animals Sleep?
Like people, most animals have times of rest each day called sleep. Some animals sleep whenever they are not eating or grooming themseleves.
Predators are among the best sleepers of all animals because they worry the least about being attacked. Like many wild cats and leopards sleep in trees. Most American black bears and grizzly bears, from 4 to 8 months.
Polar bears, who prey mostly on seals and fish, live in the artic regions around the North Pole. Sleeping a lot helps them.
Some animals, such as gorillas, sleep peacefully because they are to large to have enemies.