SAhe would have other symptoms if is was her tonsils like sore throat, and ear aches, could she be allergic to anything around her bed or anything she drinks or eats before bed, has there been any decoarating of her room, any paint or wood smells?Does she cough during the day, What about any new cuddly toys and blankets she may hug, as children do, are they new , check out what is around her when she goes to sleep, there could be an answer thare . Lastly is she upset about anything, any new sibling, any new school, a move?