A partial solution is to get one of the finger blood O2 meters that will record, keep it on overnight and you get a log of heartrate and O2 levels in the blood.

A partial solution is to get one of the finger blood O2 meters that will record, keep it on overnight and you get a log of heartrate and O2 levels in the blood. Look at your O2 levels and see how low the percentage goes, if you get some serious dips then you quite possibly have a serious apnoea problem and need to get it properly checked ASAP. I think you should be in the 90-100% range, go below 80% and you're really heading towards trouble. When you stop breathing your O2 falls. (Usual disclaimer, I'm not a doctor etc)