DD recently visited a pediatric neurologist who specializes in sleep issues. He told us to start her on melatonin and ordered a sleep study. The melatonin has changed our lives! We only give it to her on school nights and she is out like a light. The only downside was they had us give it to her on the night of her sleep study and she had literally the calmest night's sleep she has ever had. She is a good sized 9 year old and takes 2.5 mg (it is combined with chamomile so that may help too) about an hour before we want her asleep.