A few years ago, an email from Marine Gen. James Mattis began to make its viral way around the Internet. In it, Mattis extolled the importance of reading to gain an understanding of history, taking advantage of the experience of previous warfighters in order to prepare oneself for the future fight.
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.