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Permanent daylight saving time is not the fix we think it is

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Source: The Boston Globe
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Susan Kohl Malone is an assistant professor at NYU Rory Meyers College of Nursing. “Spring ahead, fall back” may soon be a thing of the past. In July, the House of Representatives, Republicans and Democrats alike, voted to end the twice-a-year ritual. I share this instinct as a nurse and a sleep scientist. Changing clock times is not good for us, but the bill now in the Senate would lock Americans out of sync with the sun. The Sunshine Protection Act would make daylight saving time permanent. That sounds wonderful: more light after work and school, longer evenings. But there’s a catch — making daylight saving time permanent does not create a single additional minute of daylight. The sun does not change when it rises and sets; the clock simply relabels the hours. Permanent daylight saving time would take an hour of light from winter mornings and shift it to the evenings. That trade is the problem, because morning light and evening light are not interchangeable. Our bodies run on internal clocks that are set by the sun, not the clock on the wall. Morning light is the master signal: It resets our internal clocks each day and tells the brain to trigger a surge of cortisol.

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