What's sleep ?

My son has not been sleeping much this has been going on since he was a year old. We had him on melatonin for years and the only way he would take it is crushed in his juice. Melatonin is a natural chemical that your body has to help you sleep and alot of autistic children lack the adequate amount to help them sleep. He was no longer drinking his Juice so it was wasted and it was so expensive. Anyway, since he has been out of school it has gotten worse. He was up till 3:30 AM and he got into bed with us at that time and at 4:30 he was back in his room. He finally fell asleep but was back awake at 9:30 AM poor guy he ask us today to give him Tylenol PM I told him we couldn't he was too young. So we bought melatonin and told him now you have to swallow this and ask do you think you can? he said yes so I will find out if he can or will. I will do a follow up later. Thanks for reading.