Hello D.,
Two of my 3 continue to struggle with settling in to sleep, as I do, as an adult.
1. Have you considered the Family Bed? It worked for us until each child hit 5 or 6, after which we phased into their own beds gradually. All it took was patience & understanding from my husband and the ability make an unpopular, but not unheard-of, choice for me, my girls, and our family. An extra benefit: it helped me sleep more & better.
2. Less TV in evenings, esp. within 2 hrs. of bedtime. Daily exercise, earlier in day, a must.
3. Most sources that advise a nighttime routine describe it as simple, a few steps, taking maybe 5-15 min. Ours took and take longer. I think the longer lead-in and more "steps" help. While on many nights I slacked off or resisted this time spent away from my unfinished tasks, I don't regret a minute of it now that they're older.
3. Quiet music helped one but not the other. A warm bath helps one more than the other. One likes a brighter nightlight; one does better with dimmer, which I go dim after 10 min. or so. You truly have to try different things with different kids. As they grow, they may be able to tell you better what works.
4. Playing the "high-low-high" game gives coveted 1:1 time. It's simply sharing in turn the highlights and a 'low' of the day.
5. Finally, for the years ahead . . . now that my youngest is 8 and in summer we tend to forget to get started, she takes more responsibility for getting ready for bed (vs. dragging out the routine) with the incentive that if she's in bed by a certain time, I'll crawl up there (top bunk) and cuddle, read, or pillow-talk with her for 5 minutes.
Good luck. My favorite idea came from another mom at La Leche mtg. 12 yrs. ago: she decided that children come in "Sleeper" and "Nonsleeper" models. We each had sleepers. And still do. Not the worst problem in the world, esp. once they learn just to lay there, as I did growing up!
M. A.