If you have trouble falling asleep or taking a satisfying nap, take a look at aSleep for the iPhone and iPod Touch. aSleep is a simple white noise/sound generator that you can turn on at night or when you want to close your eyes and imagine your somewhere else for awhile.
It has a timer that can automatically shut the sounds off after a specified amount of time. Currently sounds include Rain, Wind, Beach, Forest, Relax and Meditation. Personally, I think Rain is the best…although I’d like to see some thunder mixed occasionally.
Visit the aSleep iPhone App Site