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When the clocks go back each October, we gain an hour of sleep and lose an hour of evening daylight. The practice of moving the clocks forward in spring was introduced partly to save energy, by making better use of daylight at the end of the day so there would be less need for artificial lighting.

But the lights in our homes have changed dramatically since the U.K. first adopted daylight saving time in 1916—and the change over the past decade or so has been especially rapid. A modern LED bulb can produce as much light as an old-fashioned 100-watt bulb while using a fraction of the electricity. This raises a question: in an age of energy-efficient lighting, does changing the clocks still save us much energy?

The U.K. introduced the clock change in 1916, during World War I, to conserve fuel and enhance productivity. Moving the clock one hour forward would delay sunset relative to the time, and hence should save energy by reducing the need for lights after dark.

After a few tweaks in the 1960s and '70s, the current scheme has been in place since 1980 , with clocks going forward on the last Sunday in March and reverting to Greenwich Mean Time on the last Sunday in October. Since the mid-1990s , these dates have been harmonized across the EU to reduce any disruption in travel and business.

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