Hi! I have read John's ADHD book and it all makes sense to me. However, I am having a hard time figuring out why my 13 year old son is so hyperactive. He literally cannot sit still to complete homework, eat dinner, play a game, watch a tv show or movie, etc. He is not able to focus on any one thing longer than 5-10 minutes. He is constantly moving and figeting and it is exhausting! I know this type of hyper behavior is common in younger children, but how can you explain it in a 13 year old boy? Is there anything I can do to help him relax and calm down?