Global darkness shortage poses health and sanity risk

"A number of health and environmental problems are due to a loss of darkness," says Dr David Crawford, executive director of the International Dark-Sky Association, a group that campaigns against light pollution. "And it will get worse as we creep -- or rush -- to a 24/7 world. All of life, all of it, has evolved with a day/night cycle -- the circadian rhythm. It's essential to good health. Many studies are now showing that those who go without a true day/night cycle are adversely impacting their immune systems, and that's not good."