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 King Feature Syndicate, the USA Today, the LA Times, The New York Times and The Wall Street Journal.
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