I never even thought of that, tbh it's getting harder for me to hear certain sounds. My gf talks very softly so I definitely know what you mean & I am constantly mistaking what she's saying.
I think mine is from my years of being a sound guy, I used to install studio setups, snakes, mixers, wireless microphone setups, & did consulting for play or band p.a.'s & I guess it's taken its toll on my ears. I also keep the TV on when I sleep it seems to be OK as long as there is some kind of background noise but it gets louder & more annoying the quieter it is, so I can't sleep like that... I've actually started using one of these bose Bluetooth ear plugs in one ear for when I'm out of the house & it helps, I just play podcasts or music on it at a low volume.
The right one is much worse than the other so I keep it plugged onto that ear. Its actually gotten pretty bad recently since (my uncle is in a band) I had set up his p.a. as a favor, & I got called back over there as another favor for an issue with the wireless mics while they were having practice... & the stupid bass guy just would not stop while I was trying to troubleshoot it, literally with my head right next to the speakers at times & I felt my right ear pop. It was pretty rediculous, I told my uncle I won't be helping him anymore if that guy's there I kept telling him "can you stop? nobody else is playing..." even when I had everything on the p.a. off, his amp alone was still so loud that the windows were vibrating.