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Global darkness shortage poses health and sanity risk







Global darkness shortage poses health
and sanity risk

Global darkness shortage poses health
and sanity risk
03/22/2005 05:01 PM

Cory Doctorow: There's a global shortage of darkness, and it's not good for us.

"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..."

Once at work, overriding the craving for dark and sleep comes at a price. "They activate the `fight or flight' stress mechanism," says Foster, "and we know that stress in turn can suppress the immune system." Bright lights, caffeine and nicotine artificially maintain stimulation. Perhaps unsurprisingly, studies show that nightshift workers are at increased risk of a range of health problems, from stress, constipation and stomach ulcers to depression, heart disease and cancer. For example, a 2001 study in Seattle, based on interviews with 800 women, found that females who worked the graveyard shift could face a 60 percent increase in the risk of breast cancer.

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