I have a friend who is one of those people we always seems to be going. Either working or puttering here and there. There are always things to do or something to get done. Whenever he does finally sit and just take a minute, he is often asleep within a couple of minutes. I am guessing it is something vaguely similar. Without the medical component.
Yep. The most active people tend to be the healthiest physically, so why wouldn't it be the same for the brain? It is part of our body after all. Not saying your friend or I are healthy, but I think that "moving" is good for conditioning, and if we consider that we are physical, mental and emotional beings, moving each part in the right way likely helps them align to all work well together.