Melatonin in Pediatric FD Population

There are two specific aims in this study. Specific Aim 1: Determine if melatonin results in a higher grade of clinical response than does placebo in children with functional dyspepsia (FD). Hypothesis: treatment of FD with melatonin will result in a higher grade of clinical response than will treatment with a placebo. Specific Aim 2: Evaluate the relationship between changes in sleep and improvement in pain in pediatric patients with functional dyspepsia receiving melatonin. Hypothesis: There will be no association between improvement in pain and improvement in sleep in children with functional dyspepsia receiving melatonin.