Daylight-saving time on the proof

Every year we turn our clocks forward by an hour at the last weekend in March. This year the change to daylight-saving time, or summer time as many people call it, took place yesterday, on March the 25th.

Summer time will reduce energy costs by aligning the time we spend awake and working with daylight. Since it’s introduction in 1916 the clock change has caused many debates and has resulted in many research studies. Research teams have proposed health risks due to the change in clock time twice a year, saying it has similar repercussions to jetlag, shift work and sleep deprivation.

Imre Janszky from the Karolinska Institute in Stockholm in Sweden has found in a second study that the hour of clock change in the end of March has a short-term influence on the risk of suffering from an acute heart attack (also known as acute myocardial infarction). With an international team of scientists, he found that the sleep deprivation caused by the one hour of time difference resulted in a 4% increase in people admitted to the coronary care units in Sweden over a period of approximately one week. “The sleep-wake cycle appears to require several days to adjust to the official time after the shift,” he states.

The daylight-saving adjustment has also been criticized for not having a significant impact on energy consumption. Dr Simon I Hill and his team from the University of Cambridge   found that “having BST year-round would lead to energy savings on the order of at least 0.3% in the months in which the UK currently has GMT” (winter time).

This is one of the reasons for the proposed Daylight Saving Bill in the UK which received ministerial backing last autumn for a trial period of three years. The switch to the GMT+1 timezone would help aligning waking hours with daylight hours in Britain.The daylight-saving time has reportedly been found to reduce the risk of accidents. In January, however, the bill was brought to a halt due to a lack of time in the parliament and the Scottish Government has been reported to object  because of the longer duration of darkness in the morning.

The recent change of the clock is expected to raise the discussion again.

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