Ive used this app for a few years over many iOS updates and 4 iPhones. I love it. How it records before I make a sound is pretty neat, however, it shuts off at any point in the middle of the night. I have contacted these developers several times, and have yet to get a response. I have to dock what would otherwise be a rave review 2 stars for this. Excelltech, answer your emails.
The Jagerbombcast about Sleep Analyzer, v3.21