Hi, my son was born with Autism and had severe reflux although we did not know until he was six (about the reflux). Dx d with PDD- NOS ar age 2 ish but obviousin hind site. Never slept more than 3 hours in a 24 hour period. At age 6, melatonin recommended and fell asleep in 15 minutes. Did not stay asleepfor quite a few more years. Was on a ver low dose (a liquid squirt Natrol Melatonn. We stopped abou 2 years ago and slowly he went to bed later and later until it was past 5:00 AM. More a symptom of lifestyle as my husband works from home at night and of course kids on the spectrum love the computer. My husband is a web Designer. Recently my husband suggested we try Melatonin again. H was on it from 6 -16. 10 yrears and we did not know it could be dangerous. Both our PCP and Psychopharmacologist/Psychiatrist said it was fine. About 3 weeks ago we started 3 mg.Natrol tablets. It knocks him out within 1 maybe 1.5 hours, sometimes much lwss. Is this dangerous? Also he seems to be more agitated but simultaneously with some other changes (big) that occurred. He goes to bed 6 hours earlier now. Wondering if I should cut pill in half. Is 3 mgs a high dose for 19 year old. 6 3 240 lbs. Any advice, Thank you! Warmly, A mom who is burnt out. He is freaked out over the whole Trump/Isis/Russia/Boston stuff as weland feels like the world is falling apart and says everything goes wrong :(