Night Lights is a phenomenon of light that appears in the night sky, usually over cities and towns. It is usually caused by air pollution, especially from burning fossil fuels from industry, automobiles, and residential heating. The light is created by a combination of sunlight and particles of dust and soot that have been released into the atmosphere due to human activity. The effects of night lights are profound. It tends to disrupt our sleep pattern and can also inhibit the production of melatonin which is responsible for regulating our biological clock and sleep cycle. Additionally, it can create a type of light pollution, which can interfere with photography, astronomy, and other activities making use of darkness to observe celestial activity. There are some ways to reduce night lights, such as providing more efficient lighting systems with high intensity discharge lamps, or simply turning off unnecessary lighting. Another solution is to regulate the types of fuel used in industry, automobiles, and heating. This will reduce the amount of harmful pollutants entering the atmosphere. Night lights can have serious effects on our health and environment as well as our enjoyment of the night sky. As cities continue to grow, it is important to take steps to reduce the negative effects of night lights on our environment and health.