I don't know what a constant trace curve is. My overall point was that OP can get an inexpensive meter and check his blood oxygen while sleeping rather than trusting a doctor.
My bad, I thought you were OP!
I wanted OP to answer some questions so one could try to get an idea of what this might be.
A decent O2 meter will show a saw-like pattern, or a similar pattern, that will indicate that the reading is correct.
Ahhh, yeah, the $10 one I have shows that (in sync with pulse), and shows PI%.
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