Interesting. I have theories that my son is generally calmer after exercise. However, his behavior is negatively impacted by being tired or hungry. Not sure that I have the evidence to conclude anything definitely, but that is what I suspect.
Our LA teacher gives MASSIVE hw assignments. For a kid like mine who tends to get easily distracted, one night's assignment can last 2 hours. My older son had this teacher for honors LA as well and he was reduced to tears a few times.
Unfortunately, the teacher seems to be the "tough love" type - she means well, but our hints that the hw schedule is too severe has only resulting in her indicating that they could use even more.
We're in a very competitive district, with lots of engaged parents, so I can see the desire to pile on the hw. But I'm a believer in quality over quantity.