If you have difficulty falling asleep or staying asleep, you might be interested to know that a “leading consumer magazine” found that sound machines work almost as well as prescription drugs to help you sleep. If you’ve heard the sounds from some of those machines, though, you probably realize that some of them use loops that repeat. Waiting for the repeat can be enough to keep some people awake. The Ecotones Duet Sleep Sound Machine from Adaptive Sound Technology Inc doesn’t use loops; it “dynamically composes sounds from an integrated library of proprietary natural sounds”. It listens to the ambient noise in your room and can automatically adjust to cover the noise to help you sleep. You can have the machine run all night to help you stay asleep, or you can set a time to turn off the machine after you’ve gone to sleep. You can get the Ecotones from Adaptive Sound Technology Inc or from Amazon.com for $99.95.