More Justification for Curtains (01-07-20)

Research published in Sustainabilityindicates that even apparently low levels of outdoor light at night can degrade human lives.  A research team lead by Grubisicdetermined that “even low light intensities of urban skyglow can suppress melatonin production. Melatonin synchronizes the day-night-rhythm in animals and humans. It adjusts the circadian clocks of cells, tissues and organs, and regulates other seasonal processes like reproduction. . . . The sensitivity threshold for humans is 6 lux – street lighting is typically higher.  Artificial light at night can disturb the nocturnal melatonin production. . . . For comparison, the illuminance levels at night: On a starry night, the illuminance is 0.001 lux. On a full-moon night it reaches a maximum of 0.3 lux. The skyglow of a city, a form of light pollution, can reach illuminances of up to 0.1 lux, and outdoor lighting on the order of 150 lux.. . .The light from artificial lighting shines into the night sky, brighter with rain and snow, and is reflected by clouds and particles, which is called skyglow.”

“Light Pollution Can Suppress Melatonin Production in Humans and Animals.”  2019.  Press release, Leibniz-Institute of Freshwater Ecology and Inland Fisheries,