Two things have helped me greatly over the years. I too have some nights when I keep thinking about some problems or issues, and that keeps me awake. So I use two tricks to get me out of that state...
First, when I realize that I'm keeping myself awake by thinking about things, I say to myself, "No talking". That usually stops the talking/thinking for a bit, and if it starts again, I just say "No talking" again to remind myself that it will take silence for me to be able to go to sleep.
Another trick that I found lately is to use visuals to distract myself and provide some entertainment as I fall asleep. If I look around a bit (with eyes closed obviously), I can often see patterns. They vary all the way from just texture like you would see on a textured plaster wall, to geometric patterns, faces, landscapes, and so on. The patterns are transitory, usually fading within a few seconds, but then some other pattern starts to form. Sometimes I fall asleep and the patterns turn into lucid dreams, which makes for a very fun night!
So maybe give those two tricks a try. They have been a very big help to me.