Crossword Genius

Sleep clinic study (3)

Ross

I think it could be either:

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3

5

'sleep clinic study' 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 "radiation unit" , "Sleep stage when dreaming occurs" , "Phase in sleep" .)

I've seen this clue in The Wall Street Journal.
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