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"Science fiction operates a little bit like science itself, in principle. You've got thousands of people exploring ideas, putting forth their own hypotheses. Most of them are dead wrong; a few stand the test of time; everything looks kind of quaint in hind"
- Peter Watts

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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Additional resources:
  More Ideas and Technology from Methuselah's Children
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Methuselah's Children
  Tech news articles related to works by Robert Heinlein

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