For all of you Boston Marathoners reading this article, there’s only a little time left to prepare your body to endure the demanding 26.2 mile course. Aside from being well trained in advance, surviving an incredible endurance event such as a marathon depends on your body feeling and functioning well, and having the fuel on board to drive your metabolic engine to the finish line.Routine and adequate sleep is critical, since your body does not heal well with insufficient sleep.