The previous suggestions are good ones. Anxiety is a well-known sleep-wrecker. And I use melatonin myself to improve my chances of sleep, but be sure to get a pediatrician's advice on dosage. It's a natural hormone produced in the brain during the dark hours to promote sleep. It's a powerful antioxidant, too. It should be used only at night for several medical reasons.
You might also want to make sure that your daughter's surroundings are as non-toxic as possible. I have severe chemical sensitivities, and if I get cumulative exposures to perfumes and other chemicals that are common in laundry products, air fresheners, many household cleaners, or too much auto exhaust, new plastic smells, etc., it really jazzes up my nervous system and makes relaxation and sleep virtually impossible. There are some food colors and preservatives that have also been proven to stilmulate children who are already prone to hyperactivity.
One more thought, and this is something I'm going to investigate further: I just heard a report on "integrative mind-body training" on NPR, which you (as a sleep-challenged person yourself) may be interested in hearing about. It appears that it can promote actual physical changes in the brain in as little as 11 hours of total practice, resulting in a less stress, a reduction in the production of stress hormones, and improvements in mood. Who among us can't use that? Unfortunately, the article is scant on where one would go to find such training, but I'm keeping my ears open. It sounds like something children could possibly practice, too, since only a half-hour a day makes a difference. Here's the report: http://www.npr.org/templates/story/story.php?storyId=1293...
It sounds like you are paying serious attention to possible causes – good for you! Good luck with this. Sleep issues are really challenging, and they don't tend to get any easier as we age.
