[makeitdouble]

I think it will wildly vary depending on how regular your life cycle is.

As an anecdote I also tried tracking my sleep, only to realize:

- consumer trackers are wildly inaccurate (best we can do is compare them to a "medical grade" reference tracker, which might be accurate or not, who knows)

- there was so many other things going on every day, pinning it down to even two or three factors was just impossible (e.g. I drink more coffee when I have more time to make it, which is related to my stress level and work volume etc.)

- watch data were a PITA to export and analyze separately. I did it twice or thrice and didn't bother after that.