In the National Football League, the left tackle position is one of the most important on the field. The average quarterback, like most people, is right handed, and so his back is naturally turned to the left side of the field. Left tackles are responsible for protecting the quarterback’s blindside. Good quarterbacks feel pressure from a pass rush, and have a rapid release to get the ball out before they go down, but the results of not seeing a hit coming can be disastrous.
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.