Makes noise during REM sleep (6)

I believe the answer is:

snores

(Other definitions for snores that I've seen before include "Makes nasal nocturnal noises" , "Raucous nocturnal sounds" , "Raucous sounds of sleeper" , "Makes raucous sound while sleeping (6)" , "Emits racuous nocturnal noises" .)

I've seen this clue in The Washington Post.

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