DH kept saying he could hear kitchen noise after he went to bed, cabinets opening, dishwasher, ice maker, microwave, etc. We replaced the bedroom door with a solid steel door with no gap under the doorway. It was like soundproofing the room. No sounds at all disturbs him now. My FIL used a white noise machine when he was here with us. He slept in the afternoons when the house was full of kids/pets/visitors and no sounds bothered him with the machine on.