I actually had better sleep last night than I've had pretty much any night since early Feb when the tinnitus got louder, even compared to nights I took Ambien. But last night, I just took the usual 1.25mg melatonin. I still woke up at times and was awake well before my alarm, so I don't know how much sleep I got, but I could tell it was much better than the previous two nights. So, part of the reason for the better sleep might have just been that I needed the sleep more after the previous two nights of so little sleep.
I'm thinking about getting a Fitbit Charge 5 to track my sleep. Even if it's not that accurate for my sleep patterns, I could at least use it as a baseline for myself. It would have been interesting to compare the data from these last few nights.
I have the Charge 4 and I can (and do,at times) track sleep.