Over the past two decades, science has increasingly turned its attention to exploring the effects of light exposure to human health. What was once a somewhat shaky scientific proposition is now widely accepted, if not yet fully understood: chronic exposure to artificial light, particularly at the wrong time of day, is dangerous to health. And sleep, which can be deeply affected by light exposure, is one critical piece of the puzzle.
Even with pretty amazing technology at our disposal, dreams—their function, their purpose—remain relatively little understood. The study of dreams through brain accidents, abnormalities, and disease will likely continue to be a source of new details that enrich our knowledge of this most mysterious aspect of life.