Suggest Treatment For Child Suffering From Asperger S And ADHD

Hello. My 8 year old son, who has been diagnosed with Aspergers and ADHD has recently started Strattera, 25mg. He is supposed to increase his dosage to 40mg, but he can not sleep. He has woking up no less than 4 times a night since starting the med, and is unable to get any kind of decent sleep. My son is miserable. Please let me know what I can do to help him sleep, without stopping the medication. Thank you.