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Deep Sleep
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Why don't animals sleep as deeply as humans?
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regarding your answer "In a Pickle" surely we all need security when we sleep Animals or Humans. I would think that if we slept in the open (in Africa for example) we would stand a good chance of being eaten. But for our security we generally have someone to stand guard or pick a place to sleep that is safe. I would have thought that animals are intelligent enough to do this also.