> I also find the reasoning in "Why track your sleep at all? If you’ve had a crap night, you’ll wake up tired." weird. That's the equivalent of saying "Why track your blood pressure at all? If you've had a problem with high blood pressure, you'll wake up with a stroke." Not that the sleep tracking on smartwatches seems to be worth much but I just don't agree with the logic.

Equating tracking sleep to tracking a diagnosed and dangerous medical condition seems ridiculous. Not even remotely equivalent. There are lots of things in life that aren't worth the effort of tracking. There was a recent post here about a guy who spent years meticulously tracking every aspect of his life so he could crunch all the data and learn something interesting about himself. He learned in the end that he learned nothing new worth knowing.

"Why track your tumor at all? If the tumor becomes malignant, you'll wake up dead". That must be equivalent too right?

The reason to track things is simply to make cool graphs, and that is certainly a very valid reason!

> He learned in the end that he learned nothing new worth knowing.

A valuable data point for me though!