I think it improves my sleep maybe about 10%, but it does not solve the problem of me absolutely conking out as two or three in the afternoon.
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One of the signs of sleep apnea is afternoon fatigue and tiredness. Dad was a farmer and he had a hard time not taking a one or two hour nap in the early afternoon. In those days - 1950s - we were mostly ignorant about sleep apnea, so dad just persevered through it. In his later years, he went into the hospital to have his insulin adjusted and the nurse said she put him to bed at night, came in to check on him later, and he had passed without even disturbing his bed covers.
I agree about the afternoon naps. Yet, they perpetuate the issue, because once you have put in 2-3 hours of (delicious) afternoon sleep you don’t sleep as well in “normal” sleep time.