Apple should put its money where its mouth is here. Give the sleep monitor feature a double blind mode. Let you put it to the test. For however many nights you set, it will record your sleep patterns and guess a score, but not show you it til the end of the test period. Each day of the test period, you rate the quality of your sleep without being able to look at the score. After the test period, you can see if it does any better than chance.