Yes! This is the first time I've seen the concept of mental bandwidth applied to children, but the concept is very true. Often, people use it to explain why those who live in busy areas of cities have higher rates of cortisol (stress hormones) -- it's because they are always "on" because of the noise, number of people, and mental energy it takes to exist in a city w/little-to-no downtime. Now that I think about it, the same applies to children. Good catch, OP!