But don’t be fooled! Even with its eyes closed, a cat can be instantly alert if startled by a noise. Cats have two sleep phases, which can be either light or deep. How Much Sleep Do Cats Need?

6. Sharks Sharks are perhaps one of the most fascinating creatures that can sleep with their eyes open. Unlike most animals, sharks don’t have eyelids, so their eyes stay open even when they rest.

A file photo of a cat covering its eyes. A kitten's unusual sleeping position has left internet users in stitches. getty images The video quickly went viral on social media and it has so far ...