A recent study highlights the impact of outdoor lighting on both human sleep and ecological systems, particularly in U.S. national parks. As cities become increasingly illuminated by streetlights and traffic signals, these artificial light sources can extend ambient nighttime light levels far beyond urban areas, affecting adjacent natural landscapes. This excessive lighting not only disrupts human sleep patterns but also poses significant threats to local ecosystems and wildlife. The findings underscore the need for more mindful lighting practices to balance safety and environmental health.