Sleeper's sounds (6)
I believe the answer is:
snores
'sleeper's sounds' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snores that I've seen before include "Emits racuous nocturnal noises" , "Raucous sounds of sleeper" , "Makes raucous sound while sleeping (6)" , "Raucous nocturnal sounds" , "Makes nasal nocturnal noises" .)