Hello Sierra & sleeptech and thank you for your input!
I didn't include the EEG because I was trying to keep the signals clear and readable. The OSA events were recorded exclusively during the N2 stage, while the last one was in REM. They probably have nothing to do with each other.
However, my thought was that maybe there is another explanation for the obstructive events (as in not the soft palate blocking the airway), given that I do not fit the OSA profile. Could a deviated septum account for such events? I wake up practically every day breathing through only one nostril... If that's the case then I may try to correct it surgically and get rid of it permanently.
I would like to ask your opinion on the result of a recent PSG study done in order to investigate a possible cause for my poor sleep quality.
I'm 42, BMI 23.1, normal BP, no snoring, no alcohol consumption. I do experience occasional day sleepiness and don't feel rested / refreshed upon waking up. I only sleep for 5-6 hours/night and have a severe circadian rhythm offset (ASPD).
The PSG revealed a moderate AHI of 19.6, with 48 OA and 2 CA events. This would not be unusual in any way, except for the fact that the average OA event duration was very long (at 42.2 seconds) and SpO2 desaturation was lower than expected for such long events (only 1 minute in total below 90%). The signals also revealed a rather unusual pattern, repeated for almost the entire duration of the N2 stage (image 1), with periodic (very) gradual drops in flow pressure, but discernible thoracic effort (images 2&3).
My GP was unable to explain the phenomenon, or how a supposedly obstructive event can be triggered in such a gradual fashion, and with such frequency. My personal opinion is that I was not actually experiencing classic OSA, but something else, that I cannot fully understand or explain. Did any of you ever had similar events?
Hint: may be related to a second type of recorded apneic events (image 4), that occured exclusively during REM and which I believe to be catathrenia (since there is no drop in SpO2 and it sometimes happens while awake (and I'm often times aware of it).