A device called Ecotones promises to turn loud noises - like noise from loud neighbors, traffic, aircraft or annoying machinery - into more pleasant sounds like a rolling surf or a gentle rain.
Using patented technology that adapts to its surroundings, this is the only device that detects harsh, unexpected spikes in ambient noise, and reacts within a fraction of a second to blunt the intrusion. One of 12 soothing "soundscapes" can be selected, such as rolling surf, gentle rain, a bubbling brook, a crackling fireplace, or a tranquil meadow, creating a serene acoustic environment that promotes relaxation and concentration.
If this delivers as promised it could be a great sleep aid. The product's website can be found here. It can be purchased here on Hammacher Schlemmer for $299.95. (via CNet)
A device called 
