The first night I tried this app it woke up my mac right on time and started playing itunes, gently fading the volume for me. I was pretty happy but still really tired so I set it to snooze for 15 minutes and immediately fell back asleep. My mac went to sleep 10 minutes later. About 90 minutes later I woke up because my phone was ringing. Needless to say I wasn't very happy anymore.

I read the previous comment, and can see that others have had problems with aurora as well. From the suggestion, I also tried alarm clock 2 and it worked flawlessly. (and it's free) Goodbye aurora.