Self Knowledge through Data - Wired article

I recently read an article in Wired about the growing use of 'personal data' - tracking everything from how much we eat to how far we run to daily blood pressure.

I admit that I track my life, and I'm glad to see I'm not the only one! I do it for two main reasons. First, I am one of those people who is motivated by getting to check something off a list. Second, I like understanding how things work, and how different things interact. Does the amount of sleep I get impact how much I eat? Are there certain times of year when I consistently spend more money?

Something I teased out of my financial data recently was that I spend about twice as much on coffee drinks in November and December than at any other time of year. I suspect it's that I spend more time shopping during those months. And, when I'm shopping (which I typically don't enjoy), I treat myself to a fancy coffee. I'm not sure how to make use of this knowledge, but it's interesting nonetheless.