Poor little gal I bet she's scared of these feelings. Have you thought about what she watches on tv? What video or computer games she may be playing? Or book she's read recently? Has she started any new medicines, or vitamins lately or even started drinking sodas or coffee more than usual? My heart races 24 hours after I have a few sips of any caffeine and it can feel just like a panic attack and keep me from sleeping. Is there noise or activity outside her room that may be bothering her such as neighbors, trees casting shawdows on her window, or even what you do after leaving her room? If your tv is on too loud, or a conversation or activity can be heard she may feel uncomfortable with what she hears. Could there be a chance someone has gone into her room in the night and bothered her. It's a scary thought, but sometimes the person who molests a child lives under the same roof and the child may never tell what is happening. Is she home alone with anyone during the day? So, I'd watch what she eats and drinks, cut out caffeine and spicy foods, get her away from tv shows and games, give her some "nice" books to read, and already suggested was some soothing quiet music played for her. They sells CDs just for this and can be very relaxing and calming. And I would mention it to the Dr just so they know. I hope this helps, and she can relax and enjoy drifting off to sleep soon.