Marc Effron, president of the Talent Strategy Group, looked at the scientific literature behind high performance at work and identified eight steps we can all take to get an edge. Among those steps is taking care of your body -- sleep, exercise, and nutrition. But the most important is sleep. He offers some practical advice on getting more and better rest, and making time to exercise. Effron is the author of the new book, "8 Steps to High Performance: Focus On What You Can Change (Ignore the Rest)."