Melatonin Deficiency

I took my son in for his yearly check up today and mentioned to the doctor that he had been having difficulties at school and that his sleep patterns are very erratic. She mentioned that many times autistic children have a melatonin imbalance, and suggested that I start giving him a small dose. I am eager to see if the results will be noticeable. He rarely sleeps an entire night without waking at least once, and often will get up in the middle of the night and no go back to sleep for several hours. I hope this works. If we can get the sleep patterns straightened out, other things might fall in line.