Light pollution is the excessive or misdirected artificial light that can have negative effects on the environment, human health, and astronomical observations. This type of pollution is caused by the overuse of artificial lighting in urban areas, which can disrupt natural cycles and behaviors of animals, affect human circadian rhythms and sleep patterns, and obscure the night sky for astronomers. Researchers study the impacts of light pollution on various ecosystems, wildlife, human health, and the night sky in order to develop solutions to mitigate its effects and promote more sustainable lighting practices.