Deep sleep (4)

I think it could be either:

Which length description are you looking for?:

coma

'deep sleep' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for coma that I've seen before include "long sleep" , "State of unconsciousness caused by illness" , "Stupor" , "Long period of unconsciousness" , "State of insensibility" .)

I've seen this clue in the Sydney Morning Herald, the Newsday and the LA Times.

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