U.S. Air Force photo by Senior Airman Sara Csurilla
To those who do it there is a self-evident answer to that question: it works. How it works, why it works and for whom it works varies, but anyone who seriously practices zen meditation on a daily basis can usually experience the following: less stress, more focus and a general sense of well-being.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.