Natural White Noise^TM based on a carefully re-engineered recording of real rain sounds. A more subconsciously appealing and believable natural sound which is not distracting and has very high noise masking properties.  It is more effective and less intrusive than either artificial white noise or a direct recording of natural white noise sources. It can speed time to sleep, enhance sleep quality and if used in the day it will create a tranquil mood. Importantly it will mask noise pollution and reduce the anxiety of heightened sensitivity to sound.