Might mean (unverified): Suspended animation for space travel.
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We found one dictionary that defines the word coldsleep:

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  1. coldsleep: Wiktionary

Definitions from Wiktionary (coldsleep)

noun:  A deep sleep during which the body is stored at very cold temperature, to preserve it; cryogenic sleep.
verb:  To experience deep sleep whilst the body is stored at a very cold temperature; to engage in cryogenic sleep.

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