Chronic fatigue is the steady state of us moderns. We are always tired. Of what, though? Few of us labor the long hours of our forebears or people in other parts of the world —we’re not baking bricks, we’re all pharaohs now. Entertainment and luxury industries have accelerated the rate at which we have access to leisure goods. We live longer, have more stable health-care systems, and wider access to food and water, generally speaking.