When you buy through our links, Business Insider may earn an affiliate commission. Learn more When you really need in need of a good night's sleep, there's nothing more irritating than lying awake ...

Noise can affect sleep for better or worse. White noise machines that emit consistent noise fall squarely in the “better” category. Constant white noise, has been shown to improve sleep quality ...

White noise is a random signal or sound with all frequencies in a specific range with equal power, and has a flat power spectrum. In common speech, one can usually hear it as a consistent hiss or a ...