I'm also sleeping challenged. Exercise doesn't necessarily prevent me from sleeping, but after a hard day's exercise my body can run "hot" and that interferes.

After a certain age, I found I needed a truly dark room to get a good nights sleep. We bought opaque window shades and that helped a ton. If a dark room may not be available (traveling), I bring a blindfold. When my daughter was still living at home as a teenager and she would sleep until 2 PM with the sunshine streaming in through her windows, I would marvel - remembering that I did that when I was young. But no more.

The best sleep supplement I have found is melatonin. I depend on it with some frequency.