Your symptoms sound a lot like mine. My overall health has been quite good as well. Mine started over a year ago now after being prescribed klonopin for a sleep issue. My tremors started at night but then became a daytime issue as well. Stopped the klonopin cold turkey after 7 months and symptoms were bad for several months after (now 10 months off Klonopin) My daytime tremors faded and are gone, but I still have nightime tremors/vibrations in upper body area as well. Also, like you not in arms/legs either. I do know klonopin withdrawal (especially cold turkey) can cause these issues, however, I am wondering why they are only happening during sleep and when waking up? I'd like to know what your neurologist tells you after your visit. I also saw one almost 5 months ago and he had no idea?? He thought the klonopin should have left my system by that time but I've read it can stick around for many months/even beyond a year etc. The only other thing I can think of is that I did have mild covid and subsequently a covid vaccine about 2 months prior to my symptoms starting as well. So in my case, I'm suspecting either the effects of that terrible drug or covid/vaccine possibly as well? I guess I'll never know for sure but the fact that it is now happening only at night is perplexing to say the least? good luck to you and please report back after your neurology appt. Thanks!!