I have not, but since you know your 02 sats go down at those times, you can turn the 02 up and then down again. Talk with your doc; preferably take him the sheet on which you've kept track with dates and times.

@A MyCOPDTeam Member that is really interesting ! There are some stretches of time where I get these Blips of unusual drops that incite instant wakefulness... really awakening with a startle .. Glad you shared. Thank you

Actually, 2 am and 4 am are times when my o2 sats tend to plunge (82%, even 79%) so badly that I wake up. 30 min of oxygen help. Sometimes I drag myself to the stationary bike to get circulation up and running again. EXERCISE. Then oxygen again and I can sleep, mostly

I am curious if others have noticed a pattern of Time of day when they have unacceptable sat rates.

Thank you Jean