for what it's worth I have this exactly and my sleep is now completely normal. For instance last night I went to bed at about 11:15, I was asleep by 11:45, slept until 7:30 when I had to pee really badly, and then somehow went back to sleep instead of getting off my ass and going to work.
I don't know if it's really productive for me to be routinely sleeping for 10-11 hours a day, but I am happy to say I am able to do so without any fans or other white noise, tinnitus be damned.
My sleep was severely impacted at the beginning of all of this; then I went back on benzos which knocked down the T and of course solved the sleep problems, then when I came off the benzos I had the worst insomnia of my life for weeks on end, and somehow after getting through that experience intact, the tinnitus is not a problem to my sleep anymore.
I find that the high frequency oscillating tones themselves often change/reduce if I can spend a few days in a very quiet, natural environment away from traffic, planes, cell towers, etc -- and I'm working on setting my life up to just live someplace like that full time -- but, even in the chaos of my urban condo and relatively fast paced lifestyle, my sleep is back to normal.