Most of those things in your first paragraph are actually taught to the student athletes that you talk about in the second. Mind-body performance is actually a big part of sports today.
"why do you think the lessons aren’t crossing over into academics?"
I don't think this. My anatomy and physiology class covered the basics about different processes. Things like sleep, stress, and attention were things that were covered in some assemblies or ad-hoc (at least from an applied standpoint and not necessarily deep technical standpoint).