The full story of how our relationship with light shapes our health, productivity and mood.'A sparkling and illuminating study, one of those rare books that could genuinely improve your life' Sunday TimesSince the dawn of time, humans have worshipped the sun. And with good reason. Our biology is set up to work in partnership with it. From our sleep cycles to our immune systems and our mental health, access to sunlight is crucial for living a happy and fulfilling life. New research suggests that ..