I think that maybe this is an age issue. I turned 91 a couple of weeks ago and certainly do not worry too much if at all during the day. But during the night after the usual trips to the toilet I have difficulty getting back to sleep. I've found the answer is reading a book, which sends me off to sleep. Fortunately, I don't have any medical problems that I'm aware of other than bits wearing out that come with old age. I'm not looking forward to it.😉