Dictionary

coldsleep en · NOUN

From cold + sleep.

(uncountable) A deep sleep during which the body is stored at very cold temperature, to preserve it; cryogenic sleep.
- He had always believed Arcadia lovely, an undespoiled planet waiting for man like a bride, more than worth decades in coldsleep aboard a spaceship, toil and danger of pioneering, isolation from the rest of humankind. 1968 September, Poul Anderson, “The Faun”, in Boys' Life, volume 58, number 9, page 33:
- By converting some of the recreation space to storerooms and adapting the storerooms thus cleared to the purpose of cold-sleep, the ship was roomy enough. 1941 August, Robert A. Heinlein, “Methuselah's Children”, in John W. Campbell, editor, Astounding Science-Fiction, volume 27, number 6:

Spelling	Features	Labels	Source
cold sleep		alternative	lexicographic

From cold + sleep.

To experience deep sleep whilst the body is stored at a very cold temperature; to engage in cryogenic sleep.
- The escape capsule in which he'd cold-slept had had another minor malfunction that left him staring drugged and half conscious through the port glass at open space for two days before the cryogenic process had kicked in. 1990, Anne McCaffrey, Jody Lynn Nye, The Death of Sleep:
- Damnation, he was quite capable of refusing to let me cold-sleep. 1956 October, Robert A. Heinlein, “The Door into Summer”, in Anthony Boucher, editor, The Magazine of Fantasy & Science Fiction, volume 11, number 4:

Spelling	Features	Labels	Source
coldslept	Tense=Past, VerbForm=Part		lexicographic
coldslept	Tense=Past		lexicographic
coldsleeps	Number=Sing, Person=3, Tense=Pres		lexicographic
coldsleeping	Tense=Pres, VerbForm=Part		lexicographic
cold sleep		alternative	lexicographic