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240 pages, Paperback
First published October 16, 2020
"...It is altogether natural, and exactly like many other fears and reactions, it has a survival value. Our sense of sight adapts so that we see decently in the dark, but slowly. It takes at least half an hour for the right pigment to build up in our eyes when the daylight’s bombardment of photons has begun to decrease, and a little while more before we reach our maximum light sensitivity, before we can orient ourselves in the dark. And the heightened sensitivity to darkness can be undone in an instant.
One look at a streetlight, a cell phone powering on, or a passing car with headlights breaks down the rhodopsin—our light-sensitive visual pigment— which falls down like a house of cards, and the eye is forced to begin again."
"Light pollution is still a term unknown to many, but it’s an exploding field of research, and light will probably soon be as strictly regulated as noise. The LED light, the modern diode, which has enabled the explosion of lighting in private gardens and industrial parking lots, could also be a solution to the problem.
Light and darkness are not a matter of black or white. We can program and dim the artificial light and adapt it to more natural conditions. If we want to."
"With this book, I examine the impact that darkness and the night have on all living creatures. In a number of concise chapters, I’ll share my experiences and thoughts stemming from my twenty years in the service of the night, as a bat researcher, traveler, and friend of the darkness. I hope that this book will inspire others, function as a reminder of the importance of letting the night be a part of our lives, and give insight into how much damage artificial light can do—be a challenge and a manifesto for the natural darkness."
"The biological clock, our circadian rhythm, is ancient, shared, and completely fundamental. Everything living today has developed in a world where the conditions are changed over the day and over the year. Our bodies simply expect light and dark in recurrent cycles of longer or shorter nights. Every organism makes use of the preprogrammed clock in different ways, as when the mimosa plant collapses its leaves at night, the butterfly orchid wakes up to life instead and boosts its scent to attract moths. The bee and other daytime insects end their shift, and the night pollinators begin. All employ the same foundational mechanism, regardless of species, habitat, or life cycle, from the 2.5-billion-yearold cyanobacteria to bats to humans.
It’s light and darkness that calibrate the biological clock. Without information about changes in the surroundings, the inner mechanism continues to pulse in regular rhythm for about a day. The morning light signals that the cycle must begin again from zero, that a new day has just begun. The clock continues over the day, through dusk toward night, the whole time with input
from the sun’s varying light. The artificial light from lamps, headlights, and floodlights is not in this equation and risks, to put it mildly, creating disorder in the system."
