Crossword Genius

Sleep cycle letters (3)

Ross

I believe the answer is:

rem

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

This is all the clue.

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

I've seen this clue in the Universal and the LA Times.
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