Artificial light is bad news for a wide range of wildlife, but it can be a particular challenge for a unique subset of species: those that make their own glow. “The cycles of light and dark have been so stable for so long that [wildlife] don’t have a response to suddenly having incredibly bright lighting in the middle of the night,” said Jeremy Niven, a professor of zoology at the University of Sussex. direct light downward is a common piece of advice for helping reduce sky glow, Owens added