Sleep Talk Recorder.

Sleep Talk Recorder is a audio app that records you while you sleep and saves any loud noises. When waking up, you can listen to what you said in your sleep. It's very amusing.

Sleep Talk Recorder isn't just an ongoing recording, becasue it has an filtering function and triggers Sleep Talk Recorder technology. To make the app work, you need a microphone first. I had got it to prove to my wife how much she talks. It works great on myiPad and I get more stuff too.

Download Sleep Talk Recorder for iPhone ($0.99) from iTunes.