WhiteNoise for Palm

From Arkansoft:

White noise, playing at low levels, can be very effective as a sleep aid. An individual handheld user can benefit by wearing earphones while using WhiteNoise, or when sleeping in bed, unplug the earphones, place the handheld on a bed-side table, and adjust the playback level to whatever sounds right for you. Generally, low levels, from Level 2 to Level 4, work well. Higher levels may be needed to overcome loud external noise sources.