So, there’s a method to my madness. That’s reassuring. Does anyone else sleep better with the gentle hum of a fan at night? For me, that’s a crucial ingredient to a restful night’s sleep. The constant, monotonous steady sound that blankets across the stillness of the night, to me, there’s nothing better. White noise is defined as a sound energy that is the same across all bands, flat and the same across all frequencies, usually in the range of 20 to 20,000 hz.