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Insight

Nature 437, 1253 (27 October 2005) | doi:10.1038/4371253a; Published online 26 October 2005

Introduction Introduction: Sleep

John Spiro1

The fundamental truths of sleep are not difficult to master: one sleeps when one is tired — mostly at night—and awakens the next day usually feeling rested and refreshed.So why put together an Insight on a topic that seems so straightforward?

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