What is a White Noise Machine?
While it is a little counterintuitive to make noise to fall asleep, it's also highly effective. Popular Science describes white noise as "A consistent noise that comes out evenly across all hearable frequencies." Essentially, white noise is a sound frequency that one hears as a gentle hum or hiss, and is similar to television or radio static, ocean surf, or wind rustling through trees, for example.
White noise machines work by masking the sounds and noises that distract you at night and keep you from falling asleep, as well as those noises that would otherwise wake you up at night.
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These consist of an enclosed fan, and enable you to change the tone or pitch of the noise.
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As the name suggests, these produce white noise sounds electronically and can reproduce nature and relaxation sounds quite naturally and accurately.