deep sleep

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deep sleep (countable and uncountable, plural deep sleeps)

  1. Used other than with a figurative or idiomatic meaning: see deep,‎ sleep.
  2. (rare, fiction) Artificially induced hibernation in humans for the purpose of long distance space travel.
    • 2004, Robert Doherty, Area 51: Legend[1], →ISBN:
      Donnchadh and Gwalcmai, along with the other fourteen teams selected for planetary infiltration, had been put into deep sleep shortly after liftoff from their planet.
    • 2005, Bob Ticer, Visiting the Strange Planet Called Earth, →ISBN, page 13:
      The Kironian had remained in deep sleep until alerted by a high-pitched squeaky sound. When the Kironian woke, everything seemed as though it had just left Kiron.
    • 2008, Cavin Wright, The Golden Prize, →ISBN, page 17:
      There is also the possibility that our aliens perfected cryogenics and simply went into deep sleep until the environment improved.



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