eternal sleep is a noun meaning "euphemisms for death (based on an analogy between lying in a bed and in a tomb)". It carries one recorded sense.
euphemisms for death (based on an analogy between lying in a bed and in a tomb)
“she was laid to rest beside her husband”
“they had to put their family pet to sleep”
Definitions, synonyms and semantic relations for eternal sleep come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.