Our use of light at night is negatively affecting the natural world in ways we’re barely beginning to study. Meanwhile, our physical, psychological, and spiritual health are significantly influenced by darkness or a lack thereof; it’s not a matter of using light at night or not, but rather when and where, how and how much.We live awash in artificial light. Since the 1930s its increase has been gradual enough that it would be easy to imagine our nights are as dark, or nearly so, as they ever...
