Crossword Genius

Sleep stage (3)

Ross

I believe the answer is:

rem

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

This is the entire clue.

(Other definitions for rem that I've seen before include "Sleep stage when dreaming occurs" , "Phase in sleep" , "radiation unit" .)

I've seen this clue in The Wall Street Journal, the USA Today, the King Feature Syndicate, the LA Times and The New York Times.
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