"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." You probably know about white noise, or have seen one of those humming machines outside a therapist's ...

“White noise encompasses sound from the complete spectrum,” she said. “Brown noise, also known as red noise, or ‘brownian ...

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“The sound machine can generate any of several types of sound, from nature [or] music,” Dr. Cory Portnuff, an audiologist at the University of Colorado Health’s Hearing and Balance Clinic, says. In ...