Crossword Genius

Sleep phase (3)

Ross

I believe the answer is:

rem

'sleep phase' 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 Penny Press, the USA Today, The New York Times and the Newsday.
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