the park are substantially increased, Wolff said. Thats remarkable, because of course the total amount of daylight in a given day is the same.
[I] But others warn of ill effects. Till Roenneberg, a university professor in Munich ,Germany, said his studies show that our circadian body clocksset by light and darknessnever adjust to gaining an extra hour of sunlight to the end of the day during daylight saving time.
[J ] One reason so many people in the developed world are chronically overtired, he said, is that they suffer from social jet lag. In other words, their optimal circadian sleep periods dont accord with their actual sleep schedules. Shifting daylight from morning to evening only increases this lag, he said. Light doesnt do the same things to the body in the morning and the evening. More light in the morning would advance the body clock, and that would be good. But more light in the evening would even further delay the body clock.
[K] Other research hints at even more serious health risks. A 2008 study concluded that, at least in Sweden, heart attack risks go up in the days just after the spring time change. The most likely explanation to our findings is disturbed sleep and disruption of biological rhythms, One expert told National Geographic News via email.
Daylight Savings! Lovers and Haters
[L] With verdicts on the benefits, or costs, of daylight savings so split, it may be no surprise that the yearly time changes inspire polarized reactions. In the U.K., for instance, the Lighter Later movementpart of 10:10, a group advocating cutting carbon emissionsargues for a sort of extreme daylight savings. First, they say, move standard time forward an hour, then keep observing daylight saving time as usualadding two hours of evening daylight to what we currently consider standard time. The folks behind Standardtime .com, on the other hand, want to abolish daylight saving time altogether, calling energy-efficiency claims unproven.
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