The way I experience it is as follows.

Normally:

- Tinnitus: 100%

With ANC:

- Tinnitus: 50%

- Bose ANC: 50%

I like the ANC sound more than my tinnitus.

I haven't noticed my tinnitus becoming worse or less worse.

Oh, by “the ANC sound”, do you mean the white noise floor of the ANC?

In that case, have you tried something like the Bose Sleepbuds? Same idea, much more comfortable to sleep with.

Bose recently retired their 2nd attempt. The team behind those have a new one coming out in January, https://ozlosleep.com I'm pretty interested... hard to tell how long the pre-sale discount lasts

It doesn't seem to have ANC, so it doesn't noise cancel, it only masks. And if ANC is the same as masking then they'd need to put that in their marketing.

Also: yep, that's what I mean by it, the white noise sound.