Id get noise cancelling headphones, or wireless headphones. I have a nook with a sleepytime app that plays a variety of white noises...river, rain, thunder, cat purring, traffic...you name it. I'd try that for a week or so and if doesn't help, have a blunt conversation with them telling them what you're hearing (give specific examples if you can, shame them into shutting their pie holes) and what you've done to drown them out and how it's affecting your job performance/satisfaction.