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Neck positioning maybe? Do you grind your teeth... does your T show any somatic symptoms.
I have a feeling too that my head position changes the sound...
I don't grind my teeth that I know of. I might try a dental biteguard anyway. My T is somatic yes, it changes with extreme neck movements. But I remember reading that something like 70 percent of people with tinnitus have that regardless of the cause.
oh man... if yours is heavily influenced, maybe you should try a splint or therapy for your neck mayhaps.
Yes, so many sleep positions are not good for posture and alignment. Especially if you have an issue with your neck (bulging disk), poor "sleeping posture" can exacerbate effects. Even if your neck is ok, and your jaw/teeth/bruxism issues are the reason for T, that can still be influenced by your neck (by creating more muscular tension and tension in the jaw).
Also, if you have jaw issues, you might just be putting the wrong amount of pressure on your jaw. Feel free to PM me if you want to discuss further.