I replied to a similar thread in the Self-help forums. I use a combination of mood tracking tools. I use a free website called Moodscope every morning for an overall mood level based on rating 20 simple items, and fill in a 9-point scale mood rating for the prior day (so I have a first-thing and a retrospective score for each day). I don't use it much, but I have an iPhone app called My Mood Tracker that I like pretty well. I also track some other stuff, like drinking, hours of sleep, time of the month, meds. I dump all of it into Excel at the end of the month. I can now run some nifty stats on my mood data since I have a year of pretty consistent data. Separately, I also track sleep quality and activity level using FitBit.

Yeah, I'm a data geek...