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"This category [science fiction] excludes rocket ships that make U-turns, serpent men of Neptune that lust after human maidens, and stories by authors who flunked their Boy Scout merit badge tests in descriptive astronomy."
- Robert Heinlein

Cryonaut  
  An astronaut placed in cryonic sleep.  

Bester refers to cryocoffins, cryocapsules and cryonauts, but never uses the word "cryosleep" to describe their state.

As far as I know, the first use of the word "cryosleep" occurs in Man: The Next Thirty Years, a 1968 book by Henry Still:

"There's still a third alternative which you might wish to consider." The doctor paused thoughtfully. "Perhaps you've heard of cryosleep?"

"You mean that thing where they quick-freeze you..."

Here's how cryonic sleep works, according to Bester.

Projectors flashed on and there were three bods on the stage alongside Guess, bowing and smiling. They were smallish but looked strong and tough.

“These are the three courageous volunteers,” Guess said (in translation), “who have taken the first cryogenic flight in history. This is in preparation for the Pluto mission and eventually the stars. The constraints are time and payload. It will take the mission many years to reach Pluto, even at maximum acceleration. It will take centuries to reach the stars. It would be impossible to freight enough supplies for these men. There is only one answer, the cryonic technique.”

From The Computer Connection, by Alfred Bester.
Published by Berkeley Publishing in 1974
Additional resources -

More details:

The projectors flicked and there were the cryonauts, naked, being helped into transparent coffins by technicians. Quick cuts of them being injected, variously attached to tendrils, given some sort of sterile wash. The coffin lids were bolted.

“We lowered the temperature in the cryocoffins one degree Celsius per hour and increased the pressure one atmosphere per hour until we produced the effect of Ice III, which is denser than water and forms above the freezing point. Mid-twentieth-century cryonics failed because it was not known that suspended animation could not be achieved through freezing alone; it requires a combination of low temperature and high pressure. Details are in your fact-tapes.”

Shot of the coffins being tenderly loaded into a capsule. Cut to interior of capsule and techs hooking up complicated plumbing.

“We launched them on a ninety-day orbit, a deep ellipse.” Long shot of the launch; a gentle liftoff and then, at altitude, flames roaring down from the rocket vehicle carrying the capsule, and acceleration to out-of-sight.

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Additional resources:
  More Ideas and Technology from The Computer Connection
  More Ideas and Technology by Alfred Bester
  Tech news articles related to The Computer Connection
  Tech news articles related to works by Alfred Bester

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