I have had exactly the same issue, and have used a meditative technique that I learned in Nepal to help with sleeping: Count from 27 to 1 with each inhalation.

I have had exactly the same issue, and have used a meditative technique that I learned in Nepal to help with sleeping: Count from 27 to 1 with each inhalation. If you miss a number, ie between 15 and 14 you lost your focus and thought about something else, and missed the count, start over. My experience is that generally I will fall asleep before I get to 1, and on extreme cases it will take going from 27 to 1 more than once, but it always ends with sleep. The only difficulty I have now is being disciplined enough to not think "I got this" and try to sleep without the technique. Often what happens when I think that is I toss and turn for 3 hours before I just give in to the technique and finally fall asleep.