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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
- Neal Stephenson

Cold-Rest  
  Lowering body temperature and metabolic levels, as in hibernation; also called reduced temperature somnolence.  

In Methuselah's Children, one hundred thousand people steal a space ship with room for only about one-fifth as many. To save space (and reduce boredom during a long voyage) many of them opt for the hibernation state of cold-rest.

The ship slipped back into the same monotonous routine that had obtained during the weary years of the first jump. Most of the Members went into cold-rest; the others tended them, tended the ship, tended the hydroponds. Among the somnolents was Slayton Ford; cold-rest was a common last resort therapy for functional psychoses.
From Methuselah's Children, by Robert Heinlein.
Published by Astounding Science-Fiction in 1941
Additional resources -

See also cold-sleep from the same novel; cold-sleep is also mentioned in Between Planets.

The term "cold-rest" is used more frequently in the story than "cold-sleep".

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  More Ideas and Technology from Methuselah's Children
  More Ideas and Technology by Robert Heinlein
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