I have a small log in my emacs org mode. I note when I feel bad, pain, whatever. This allows me to see quite a lot about me and put my evolution in perspective.

I have a small log in my emacs org mode. I note when I feel bad, pain, whatever. This allows me to see quite a lot about me and put my evolution in perspective. Since I do it by hand, it forces me to distillate information and it goes at the speed of what I note (you don't need realtime information about your sleep patterns, a once per week check up is more than enough) Bonus point : I'm the only one to read it, no GDPR issue, no privacy issues. Simple, effective.