Until recently, I was carefully recording exactly how much milk I pumped each time. There's a pretty nice little app for that (there are probably several, but that's the one I used). I can't say it wasn't interesting to see how time between pumpings or time of the month or who knows what else affected the amount pumped, but it was also a little anxiety producing. And I finally realized I had probably learned what I was going to learn from it and that, really, I was never going to go and export the logs to make fancy graphs to cull more detailed correlations than my gut was already aware of. So I stopped keeping track.
It's a pretty nice feeling, letting go of a little thing like that. What's the most surprisingly freeing little thing you've ever let go of?