Don't put much faith in the "narrow throat" hypothesis. It might be right, it might not.
The important thing is do you have apnea and do you fix it with CPAP.
Get the free SleepyHead software here
for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
We upped the starting pressure to 6. I know part of it is anatomical as I have to have the dentist put in props to hold my mouth open when they need to work at the back of my mouth for too long (i.e. had a filling on back molar replaced and a crown due to cracked tooth from old filling). And I know I have a mallampati score of II/III so I know there isn't a lot of space there. We'll see what time shows and see if there is any other contributing factor after having some more thyroid tests done!
I am new too - I had the home sleep test in mid-December and got the results 12/26 though my results were not as detailed as yours.
I am writing because I, too, never had trouble falling asleep, have a small crowded mouth and discovered I had growths on my thyroid. One cannot help but wonder if these or a combination of them contribute to the fatigue. I only just got my machine last night so I only have one night of data - 4 events per hour, 5.6 was the air flow (terminology may be wrong?) with the setting being between 4-14.
Seems to be a great deal of informed helpful people here so hang in there and Good Luck