So not sure what happened there to both units.
You can see blood oxygen and respiration too.
But always corrects itself quickly.
I do agree that sleep metric appears inaccurate with my Venu Sq.
When we tried to overload the sensor with quick intervals at the end of a 10K run just after the outage it lagged significantly in real time, but did track the peaks and lows accurately.
Making it even harder to know an up to date app from a dysfunctional one dying on the vine.