Why do some animal sleep so much?

Why do some animal sleep so much?

A dog snoring away the afternoon on the living room floor. Walruses snoozing belly-up on a beach. Lions sprawled out on the Serengeti. A hippo dozing on a mudbank. 

These slumberous scenes may make folks wonder why these other mammals seem to be getting so much more sleep than humans. Do they actually need more sleep? Are they just sleeping because they can? Should humans be sleeping more, too?

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