Submitted by György Chityil ... on Fri, 01/19/2018 - 21:46 Hierarchy: NounDescription: {{rare|fiction}} Artificially induced hibernation in humans for the purpose of long distance space travel.Ngram: deep sleepNgram Text: deep sleepSource: WiktionaryIssue: 0Wiktionary tag: rarefictionNgram Count: 2
