Nothing to do with sleep apnea, but I've been wearing hearing aids for around 20 years or so now, and I've got loads of great audiophile gear, both 2-channel and headphones. I use in-ear hearing aids for the headphones. I may not hear it as well as a person with normal hearing, but I can sure tell the relative differences between gear anyway....
Obstructive Sleep Apnea and Hearing Loss
FYI, I have had sleep apnea which I did not have treated for several years. I struggled with using the CPAP machine, and continue to do so. I'm not overweight, and walk and swim, and was in big time denial. Unfortunately, I recently developed unilateral high frequency hearing loss (everything from upper midrange on up), and tinnitus on that side. The loss is irreversible; I'm hoping the tinnitus will diminish. My guess is the repeated lack of oxygen damaged the hearing apparatus. Needless to say, it's upsetting, since my retirement plan (in 3-5 years) was to sit home and play guitar, buy a new turntable (maybe a Rega 6 or 8), speakers (maybe something like the Buchardts or update my Vandersteen 2s), integrated amp, transport and DAC; clean all the used lps I've bought in used record stores over the years (I live near Revilla Records and The Princeton Record Exchange in NJ); and listen to my collection of 5-6 thousand carefully curated CDs and LPs that I've aquired over a lifetime. (I kept all my original lps, plus many recent Blue Note, Neil Young, Joni Mitchell, etc. reissues, and 40 years of collecting rock/jazz/americana/folk/blues/country/broadway/vocal/classical cds, including many early ones from Germany and many signed by the artist at small and medium sized concert venues). So, best to get proper treatment if you have this disorder!