Right but if it’s the same sensor you are wearing each night you can still learn something from the trends instead of relying on the raw numbers.

E.g there’s a definite motivation kick to drink less when I see what it does to my hrv and sleep trends for days afterwards, while I don’t particularly care about the numbers being all that accurate.

Edit: Oh and turning on afib history in your Apple Watch will make it record like 10x data points which also helps with that. Maybe