On the open source side of things, I’ll add that gadgetbridge is pretty rapidly making progress with Garmin devices. Might not be enough if you’re deep into the Garmin ecosystem etc, but if you just want something simple and private, it’s a good alternative.

I suggest using the nightly f-droid repo as there’s new updates multiple times per week.

Do naps finally count as sleep? Coz that’s been a fail forever.

Love my garmin, but sleep tracking is bs.