Dashmellow
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The chronic effects of DST have not been studied directly, but we know that DST increases the time difference between the social clock and the body clock (Borisenkov et al., 2017). More and more studies show that time differences between the social clock and the body clock challenge our health (Koopman et al., 2017; Mota et al., 2017; Parsons et al., 2015; Roenneberg et al., 2012; Rutters et al., 2014; Wong et al., 2015), are associated with decreased life expectancy (Borisenkov, 2011), shorten sleep (Borisenkov et al., 2017; Wittmann et al., 2006), cause mental (Foster et al., 2013; Levandovski et al., 2011) and cognitive problems (Díaz-Morales and Escribano, 2015; Haraszti et al., 2014), and contribute to the many sleep disturbances in our societies that are estimated to cost approximately 2% of the gross domestic product (Hafner et al., 2017). If we established DST throughout the year, the chronic effects would become more severe not only because we have to go to work an hour earlier for an additional 5 months every year but also because body clocks are usually later in winter than in summer with reference to the sun clock (Kantermann et al., 2007). The combination of DST and winter would therefore make the differences between body clocks and the social clock even worse and would negatively affect our health even more.
Down in Essex, daylight saving time may not be important to you, but as you get further north it gets exponentially more important, and the Shetland Islanders would be very unhappy to lose it. By the time you get to Iceland it stops working, in mid winter you can't get up when daylight arrives because daylight never arrives. Last century when the whole of UK ran on the same schedule with everyone working 9-5 and everyone watching/listening to the BBC at the same time, there was good reason for a national change, but I'm not sure that is valid any more, no good reason why Shetland schools should move their start time an hour in autumn and another hour in winter, while Essex schools stick to the same GMT year round. If the school children all want to watch their children's TV programs when they get home, they can watch on demand TV instead of broadcast TV.This was to have the UK stay on DST all year round which I think is a mistake as in December some places in Scotland would not see daylight till 10am!
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