Dragon -
All of the suggestions given here are excellent, and I commend you all.
Personally, a ripping orgasm would help me - but convince my spouse of that.
Conversely, I've heard a bit of Risperdal can help (not a lot). I would recommend avoiding more meds, but Ambien is supposedly helpful. It backfired on me the third time I used it.
On a more practical note - purging one's mind of nagging concerns is essential sometimes to relax and stay that way. I had horrible bouts of insomnia in my 20's - until I started keeping a stenographer's book on my bedstand. Then, before going to bed - I'd write down EVERYTHING that I needed to address the next day or in the immediate future. IF I awoke with ANY concern - I'd write it down at the awakening (so I didn't have to mull over in trying not to forget about it).
That really worked wonders for me, at that time. As I got older, I made modifications, and my over-sink-mirror resembles a community bulletin board. However, now I tend to awaken over gastric discomforts, and NOT so much over bothersome concerns. But, once I'm fully awake (transitting to and from the toilet), THEN I just tend to lay wide awake.
My Pdoc (yes, I own him, NOT) suggested that once you're awake for over 30 minutes and cannot drift back, then it might be best to get out of bed and do something (returning if you tire and relax). I go onto my computer and make ridiculous postings while C-SPAN rattles in the background.
Lack of sleep is my Boogie-Man, too. It exacerbates all the rest of life's problems.