There are certainly traits of ADHD in our eldest too - and possibly dyslexia. Unlike your son, he doesn't express it through jumping, hopping, etc. but more that he always appear to be "busy". Brain off in another world (he calls it Dream World) and always fidgeting, looking around. The only time he seems to concentrate and sit still is when the TV's on.

We're hoping to get him reviewed although that won't make a difference - it might help us as parents to better understand what's going on in his head so that we have some tools to manage it better.