Some children and teens with ADHD have difficulty going to sleep at night because they "can't turn their head off." They are fidgety and active in bed. They hear every sound in the house and can't ignore these sounds. For these people, using a medication like Ritalin, Dexedrine, or Adderall at night might be a great help in getting to sleep. (Yes, everyone thinks these medications cause sleep problems. However, when ADHD prevents you from going to sleep, being on these medications counteracts those symptoms.)
If this is not the answer, ask your parents to discuss your problem with your family doctor or a child and adolescent psychiatrist.