The Garfield comic from a few days ago had Jon telling Garfield that he had no energy and wondering if he should work out. Or just take a nap. Garfield leans in close and says "Come to the Dark Side, Jon."
Exercise and sleep are both really important. Together, they give us energy, and it's almost as good as having the Force. Unless the goal is to look like Garfield, it's a bad idea to follow his advice. RESIST THE DARK SIDE! Exercise, eat right AND get enough sleep!