Workers cleaning the clock face of Big Ben in London, England, for the end of Daylight Saving Time

It's time to fall back, for some. It's time to fall back, for some

While today's image may look like a scene from the Doctor Who TV show, its actually an image of workers maintaining Big Ben's clock face. But like The Doctor, the show's main character, today some of us are time travellers. In countries where Daylight Saving Time is observed, clocks will have to be reset today. And like changes to Doctor Who, this change isn't without controversy. Since the 1970s, many different studies have tried to quantify the advantages or disadvantages that come with falling back and springing forward. As yet there's no definitive answer on if the scheme is better or worse.