I use mine only when I have a change in medication.
I once had it on, woke up, and rolled over to pet one of the dogs after turning off the CPAP. I fell asleep without the CPAP running. Woke up feeling like crap on a stick. The oximeter reading was evident my CPAP was working!
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I use my oximeter *every night* it has been most enlightening.
My ODI based predictive number is 8.7 and I am running at about 13cm measured so I suppose it's close enough for starters
Sorry, I don't use it very often. The model I have (CME 50E) is a finger end unit that is fairly uncomfortable and falls off in the middle of the night about a third of the time. You can set an alarm, but it is so loud that it wakes my wife and I up, not exactly the whole point. I used it to verify the O2 drops associated with apnea and hypopnea events, then pretty much put it in the drawer once I had the data I needed.
Don't get me wrong, I'm a big fan of oximeter use and it is another piece of information to manage your treatment. I would maybe recommend one of the wrist mounted units (50F & 50I) if you plan to use it frequently. Some people also tape the finger ends with surgical tape to keep them on.