Review: Sleep Cycle App

I have used the Sleep Cycle App for iOS7 (?) for about 5 days now, the minimum for getting long term statistics. This morning, for the first time, the app woke me up. I couldn't figure out what the noise was for a moment. Although it was sweet to sleep in, because usually I wake up really early and  feel sleepy later in the day, there will be no therapeutic benefit to this. I already know that I have sleep apnea, and I have already signed up to have a sleep study next week. This app is just for fun. In the morning after I use it, I get to look at a jagged line graph of my sleep pattern the night before. Whoopee!