About ten years ago, I started to track my life in a diary, recording when I got up, all my traveling, what I made for dinner, which pages I read and such. I started doing this because I felt time was flying. I have the feeling that it did a little to counter this feeling. But it also made me aware of the amount of procastination (web surfing), which at times has been kind of depressing. It did me give a good sense o…
As for logging of structured data, I've sometimes thought of coming up with some kind of annotation scheme, so that, if I need, in my writing, to log a measurable quantity of some kind, I could just annotate it in a special way. And then, later on, if the need should arise, I could just extract the annotated data from the text document. I've not taken it any further, but I think it could be useful. A sort of a "hybrid approach" that would let me focus on the writing and the flow of thoughts, while also letting me log tidbits of structured data in between.