We spend about one-third of our lives sleeping. We know relatively li...
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We spend about one-third of our lives sleeping. We know relatively little about sleep.We shall know more about sleep if we spend more than one-third of our lives sleeping.Despite spending about one-third of our lives sleeping, we know relatively little about sleep.We spend about one-third of our lives sleeping so that we know relatively little about sleep.We know relatively little about sleep; as a result, we spend about one-third of our lives sleeping.
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