Both white and pink noise fans can be extremely useful in calming the body into a generous night’s sleep. White noise fans are less balanced in that th ey gather a collection of opposing frequencies to create a repetitive string of sounds. The aim is to drown out any noise that may disturb your rest wh ile establishing a noise pattern for concentration. The results often vary and can range from static, hissing, rattling and everything in between. Pink noise fans differ in that they succeed in achieving balance. The focus on balancing a mix of high and low freq uencies results in an even, reliable and constant sound output.