Look at a satellite image of the Earth. Where it was once dark as night, it is now lit up like a Christmas tree. If you zoom in on a city, you’ll see spotlights, neon lights, car lights and streetlights. If you zoom in even closer, into your own bedroom, you’ll see lamps and TV screens, tablets and phones. Humans have always struggled with darkness, but isn’t there enough light now? What is all this artificial light doing to our sleep patterns, our rhythms and our bodies? Sandberg explores our intimate relationship with darkness: why it scares us, why we need it and why the ever-looming light is detrimental to our well-being. Under the dark polar night of northern Norway, she meditates on the cultural, historical, psychological and scientific significance of darkness, while testing the limits of her own fear. For as long as she can remember, Sandberg has been afraid of the dark. Darkness is an ancient fear shared by all children. But today, in our cities permanently lit by streetlights and screens, by cars, factories and billboards, can we say that we know darkness? Sandberg writes about what happens to the body at night. She mentions sleep, stars, black holes and the global struggle to preserve a night sky. Could it be that the darkness that Sandberg has always feared is far more important than we might have thought?