2. Sleep Pillow Lite

Price: Free
itunes.apple.com

If the noisy city or the dead silence keep you tossing and turning at night, try Sleep Pillow, which features a ton of amazingly relaxing background sounds to lull you into dreamland! I tried out a number of white noise/sound machine apps and this one is by far my favorite. The sounds captured in this app are really top quality and soothing. Not only that, but you can mix your favorites together to create the perfect ambiance for you. You can even alter how loud each individual sound in your mix is. Love it!