Hi robinstwo and welcome!
Shortly after my surgery, I started to hear weird noises when I tried to sleep too - more like someone snapping a rubber band in my deaf ear than a bell. I also heard that same sound anytime the phone rang. The phone ringing thing just went away on it's own within a few weeks time. The night time noise seemed to persist a little. I started taking tylenol pm before bed and seemed to do it for me. I think it just knocked me out so I didn't notice the noise, but, whatever works, right?
It's mostly gone now, I occasionally hear an electrical type buzzing, just as I'm dozing off. I think there was a thread on here where someone found it was called "exploding head syndrome".
I think being only 6 weeks post-op, your brain is still adjusting to the changes and I think the noises should stop. Hopefully, soon!
Lori