I use Optimism Online too. It's easy to see patterns over time when you use it consistently, even if it feels like your moods are all over the place. I can compile literally five years of data with only a few clicks. I used to do a paper mood chart but this is so much easier and enjoyable. It only takes a couple of minutes, is customizable, and there's even a place to type notes about what you're feeling or what's going on in your life.