[zwily]

They still don't have the regular oxygen monitor mode back yet because of a patent dispute. That might be part of it.

[tptacek]

That's only in the US, right?

(My flimsy understanding is that blood oxygen measurement is how at-home sleep studies work?)

[jrockway]

At-home sleep studies measure heart rate (maybe ekg, some probe is on your skin), blood oxygen, sound, and the direction of gravity relative to your testing device (to classify results by "back", "side", "prone", etc.)

I did one of these and it was the worst night of sleep I ever had. It's somewhat invasive. Meanwhile, I sleep with my watch every night with no problems.

[zwily]

Yeah, you’re right.