The value of accurate tracking is comparison. As someone who suffers from chronic sleep issues, being able to accurately compare the effect of interventions on

The value of accurate tracking is comparison. As someone who suffers from chronic sleep issues, being able to accurately compare the effect of interventions on my sleep pattern, as well as account for seasonality etc is invaluable. Accurate tracking also helps forestall habituation - it's like keeping a paper diary, obviously you can't change the past (no one ever suggested you could) but you can make yourself aware of large changes that happened too gradually to be obvious.