I have an 11 year old that has been having lots of trouble sleeping. He was already taking a total of 75mg daily (25mg 3x a day) for anxiety and now the doctor has upped his dosage an extra 75mg at night time to help sleep. He is not sleeping at all (maybe 2 hours a night) and the Dr wants to up the dosage again. So my question is: how much is too much before it is unsafe?