Hey Deb,
You know something we use occationally for Annabelle is a Highlands product called Calms Forte 4 Kids. It's similar to the Teething tabs that dissolve. On the label it says:
*All Natural
*Relieves Restlessness, Sleeplessness, Night Terrors, Growing Pains, Causeless Crying, and Sleeplessness from Travel.
Anyway, we picked it right after dd was sick. She had this lingering cough that I am all to familar with, you know the itchy one. When I am like that I just need to get in the right position and relax enough to overcome the cough (even with cough meds) and go to sleep. So, we tried it and it works.
Now, we use it when a nap gets missed because she is still a bit of a Spirited and Touchy toddler - it's like having a cup of Bedtime tea. Now, that I have rambled. You might try it and see if it helps get the sleep ball rolling.