Sleep disturbers (6)
I believe the answer is:
noises
'sleep disturbers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for noises that I've seen before include "Sounds, rackets" , "Spreads abroad with sounds" , "- - Off (stage farce)" , "Conventional phrases" , "Loud or harsh sounds" .)