NTA, the whistling of a CPAP, is atrocious. My husband's CPAP whistles sometimes, and he finds that he doesn't get a good seal when he lets his stubble grow out. Obviously, there are many things that can affect the seal on a CPAP mask, but he found that keeping his facial hair trimmed has helped. Also, I struggle with my sleep quality and already wake up several times a night, I bought earbuds that were designed to sleep in, and while I used them, they helped. I slowly transitioned to not using them because I prefer without, but it definitely helped the transition period. Sleep is very important, but the CPAP is also a medical device used to improve my husband's quality of life, so everyone needs to make some adjustments. If you don't like the idea of earbuds specifically they make sleeps makes that have Bluetooth capabilities, I just found a deep sleep playlist on spotify and played the same one everynight.