Every day needs a night.

Every day needs a night. Life on Earth evolved under a regular cycle of dark nights and bright days--a rhythm that is encoded in the DNA of all living things. We need light at night for human activity, but poorly designed artificial light at night is a wasteful pollutant and has serious impacts on natural ecosystems and on our own human health. 

"Of all the pollution we face, light pollution is perhaps the most easily remedied".  Verlyn Klinkenborg