Suggest Remedy For Problem In Sleeping In Child

My 2-y/o grandson just fights sleep to the point of not staying in bed, getting up and screaming at the bedroom door almost nightly. He is exhausted, but just will scream and scream for an hour sometimes two hours per night before falling asleep on the floor right behind the door. We have tried the door open, the door closed, down time with quiet time before sleeping, giving a warm bath with chamomile baby body wash. I wondered about trying melatonin on him. I know that some physicians advise this in cases with some children with adhd and children that fall within autism spectrum, but he has no symptoms of either of those. What is your opinion?oh geez... just saw i needed to pay for an answer. Can t do that at this time... sorry for taking your time. Thanks anyway.