I remember one of my first interviews as a first-year MBA with a major, international automobile manufacturer. I did horrible ... horrible. My responses were unstructured, I did not translate my military experience at all, my communication style was stiff, and I expected the interview team to have extensive knowledge of special operations. I was the only member from my business school that did not get a second-round callback interview.
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.