Sleep HRV – An app to record true (overnight rmssd) HRV from the Apple Watch

I’m having some difficulty understanding the numbers that this gives me.

I’ve been doing morning measurements using my own Apple Shortcut to upload HRV data immediately after after a 1 minute meditation. The numbers I see don’t seem to line up with what I see in the app.

Should they?

I installed and ran the app, but only after that I set up AF history and background activity. I have refreshed the data, but nothing seemed to change.

I also noticed that the sample count in the app doesn’t seem to match the sample count I see if I dump the HRV data with Shortcuts. My data shows a sample taken about every 4 or 5 minutes, but the screenshot only shows 3 last night.

Additionally, the sleep duration is off. The value of 23:39 is either way too low or way too high.

I’m pretty sure I’m not understanding something here.