[criddell]

I tracked my sleep using a FitBit for two years and I don't think I learned anything.

How did you measure happiness and productivity and how did you correlate that to your sleep?

[Ensorceled]

I was also using rescuetime and MyFitnessPal, which tracked my fitness and productivity.

The happiness thing was more abstract... why am I unhappy? Because I’m not exercising, eating well and I’m working too many hours. Why am I doing those things? Hmmm, it’s correlated with, amongst other things stress and lack of sleep.

Fixing the sleep helped fix the rest.