Why do some animal sleep a lot?

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A canine loud night breathing away the afternoon on the lounge flooring. Walruses snoozing belly-up on a seaside. Lions sprawled out on the Serengeti. A hippo dozing on a mudbank. 

These slumberous scenes could make people surprise why these different mammals appear to be getting a lot extra sleep than people. Do they really want extra sleep? Are they only sleeping as a result of they will? Ought to people be sleeping extra, too?

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