I just installed this early this morning, because I wanted something soothing to fall asleep to, plus having a headache at 2 AM. Considering it was free, I thought Id give it a shot. I think in less than 5 minutes I was asleep. This was the most restful and peaceful sleep Ive had in some time. I havent learned how to work it quite yet; I figured how to set the music timer, but the app stayed on all night, so Ive got to figure that one out. I understand this is a free app, so sucking up the advertisements is part of the "free" addendum--there are WAAAAYY too many ads for my liking. When I did wake up, there was a full page ad. Perhaps this is why the app stayed open all night. This, and only this is why its getting 4 stars. It reads the In App purchase is $4.99; I dont purchase a lot of apps or games for/on my phone, not interested-so I dont fully know what else Im getting for $4.99, and dont wish to be stuck with s$$t I dont want or need and will be forced to keep. Also, as I moved through the features (the setting, album, etc) located at the bottom, a flipping ad would pop up as soon as I hit the button! This was irritating, to say the least. Especially at 2 a.m. When wanting to go to bed and with a very irritating headache. Other than this though, I really do like the app. May try some others, you know, just to see the differences of each. If you dont mind the ads, this really did work.