The ringing ears doesn't really bother me when I try to sleep. I spent 27 years running coast to coast hauling meat to the west and and produce to the east. Sleeping in front of a screaming reefer unit or a idling diesel became a way of life. Now I can't sleep without the TV on. My biggest trouble is the jumping feet....they get to jumping under the blanket, and the ol'ladys cat sees fit to attack.