I highly recommend this free app: White Noise.
Dr. Oz loves this app as well, and it’s clear why. Let’s say you’re on a plane and need a power nap, but the infant two rows behind you is loudly expressing its unhappiness. Or perhaps you’re surrounded by the tension of the office and just can’t seem to focus on your work. What to do? Plug in your headphones and let the comforting sound of waves crashing on a beach lull you into the relaxation response (it’s really good for sleeping, too). You can select one of 40 relaxing sounds and use it with your phone alarm so it turns off by itself.