Sounds just like the problem we had with my eldest daughter. She would never sleep; maybe half an hour a night. This started when she was about 6 months old and went on for 12 disruptive and baffling months. Our doctor sent her to a pediatrician at Booth Hall Hospital and after weeks of tests and examinations they diagnosed hyperactivity caused by an additive in orange juice called tartrazine. I think it was numbered as E223, but not sure about that. The point is, this may be a similar thing and the child is reacting to something in it's diet. The doctor prescribed a medicine called Vallergan Forte. When my wife went to collect it from the chemist, he was reluctant to dispense it for an 18 month old child. He phoned the doctor just to check there had been no mistake, but the doctor told him to go ahead. The dosage was 2 teaspoons every four hours. The chemist said he would dispense it but we had to be extremely careful as one teaspoon alone would knock a horse out for 24 hours. We stopped giving her the orange juice and kept up with the medicine until the bottle ran out, by which time she had settled into a normal sleeping pattern. It may be something similar here.