Student athletes learn more about their bodies and performance than students do about their brains.
I agree its really important to learn how one's physical body and habits shape their felt experience and to truly realize you have a lever to change it.
"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).