I’m a bit of a light sleeper when I first lay down. Having sound to drown out the other sounds of life such as cars, birds, kids, creaks, and so forth is helpful. For years I used a fan, but after awhile it would hum or rattle or do some other normally inconsequential nonsense that would thunder in my head. My wife introduced me to the Dohn Sound Machine. Steady sound, just like a fan without the quirks. Money well spent.