Crossword Genius

Sleep state, for short (3)

Ross

I believe the answer is:

rem

'sleep state for short' 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 Newsday.
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