This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. INDIANAPOLIS, Ind. – We all know someone who ...

While sleep is a crucial component of survival for all living organisms, some animals take the concept of sleep to an extreme ...

Animals have fascinating sleeping patterns adapted to survival. Dolphins sleep with one eye open, giraffes get about 20 minutes of sleep a day, and sea otters hold hands to avoid drifting apart. Bats ...

The ponderous creatures, which spend 90% of their lives upside down, have internal organs fastened in place to prevent them squashing their lungs. Famous for their slow pace of life, sloths can take a ...

PROVIDENCE – What is the world's slowest mammal, sleeps 15 to 20 hours a day and is so sedentary that algae grows on its fur? If you guessed the sloth, you're right. Roger Williams Park Zoo announced ...

Three-toed sloths have a reputation for being some of the sleepiest of all animals, largely due to a single study, which found that captive sloths snooze for 16 hours a day. That certainly seems like ...

Hanging from one arm, a three-toed sloth is asleep in a tree in Tortuguero National Park, on the north-east coast of Costa Rica. ‘It was likely climbing higher,’ says our guide, ‘then nodded off on ...