The prison camps of Nazi Germany existed for 12 years before their remaining survivors were freed after World War II. In the years that followed, many learned of horrifying conditions, torture, and millions murdered by Hitler's regime, and people swore never to let it happen again.
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.