British Summer Time ends at 2 a.m. Sunday morning. All the clocks, including London’s Big Ben, will be moved back an hour, and the U.K. will glide silently to 1 a.m. Greenwich Mean Time. In our house, the clocks are usually turned back before going to bed Saturday night so that everyone can snooze seamlessly through the extra hour. (US Air Force graphic by Senior Airman Lausanne Morgan)