I can absolutely believe this. Also pertaining to sleep quality and apnea.
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That’s why the CPAP is so valuable for breathing problems. While there was no autopsy performed following my dad quietly passing at night in his sleep, I’m convinced he died of sleep apnea hypoxia, which he displayed throughout his adult years while sleeping with long stretches of little or no breathing and then gasping for air. He never availed himself of a CPAP, which I now use religiously at night.
I have one, and I use it, semi-religiously. Every four or five nights I tear the thing off because I can’t stand it. In my case, my sleep study indicated that I had dozens and dozens of apnea events/hour at night. This unit shows 1-2.5 events per hour. 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.
My older brother, who snores like a freaking rhinoceros in heat, swears by his unit.
They are best when settings are optimized for best efficiency.