I am a consultant in real life and sleep three to four nights a week in hotel rooms with noisy clima controls and or noisy streets. I tried all of the other three AmbiScience Apps and each of them helped me sleep tight and deep! Unfortunately this solution will occupy three valuable spots on your Springboard. Luckily AmbiScience has bundled all three apps into one! The AmbiScience 3-in-1 bundle pack (iTunes) contains thirty high-quality Sound Tracks (these are relay well done and loop without the slightest gap! I still don't know how long each of those loops is and I used the Apps for about 200 times now) and ten entrainment effects. The app is a solid 153 MB, so make sure to download it on your iTunes and sync it then to your iDevice. Again, this is not just any ambience app. This is imho the best app, and def. the most used app on my iPod Touch! Six out of five stars! If you don't have it yet: get it! I forgot. This is also the first app which has savable presets for the loudness settings.
