My SO, @airkooledkustoms has also had Tinnitus for a long, long time. We sleep with ambient music on most nights because it seems to somehow equalize the tone and get it to hush.
Do you also hear "The Hum"? http://www.thehum.info
He has, off and on throughout the years, somewhat depending on where he was living at the time.
MMJ also seems to help!
Sound masking is a pretty common approach to managing the Tinnitus. I've slept with a sound machine my whole life. Definitely makes it way easier to fall asleep, though I can fall asleep without it now that I've habituated. And no I don't also hear the hum, but I have heard of it.