Crossword Genius

Type of sleep (3)

Ross

I believe the answer is:

rem

'type of sleep' is the definition.
(I know that REM is a type of sleep)

This is the entire clue.

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

I've seen this clue in the USA Today.
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