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White noise sound conditioners are useful for relaxation, concentration, privacy and serious sleep. Sound conditioners (also known as sound machines, sleep machines, white noise machines - or one of many combinations thereof) are machines that emit a consistent, soothing soundtrack. Just as air conditioners moderate the temperature of an environment and drapes allow for the control of light in an environment, sound machines moderate the noise level of an environment. Turn one on, and tune everything else out.