Your argument would make sense if sleep processes were being measured via EEG or similar means, but virtually all "sleep trackers" are just movement trackers; they're absolutely measuring a proxy that can be gamed.
> virtually all "sleep trackers" are just movement trackers
This has been false since March 2016 when Fitbit introduced sleep stage analysis based on heart rate variability. I work for Fitbit but don't speak for Fitbit. Check my comment history for a link to a help article with details.
This has been false since March 2016 when Fitbit introduced sleep stage analysis based on heart rate variability. I work for Fitbit but don't speak for Fitbit. Check my comment history for a link to a help article with details.