Light (IMAGE) Helmholtz Centre for Environmental Research - UFZ Caption Light does not just influence biorhythm of organisms in the city. Even in many conservation areas, the sky has become considerably lighter than originally at night, due to neighboring cities. Credit Photo: André Künzelmann, UFZ Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.