The annual ritual of setting clocks back happens at 2:00 am on Sunday as daylight saving time comes to an end for 2016.
According to David Prerau, author of "Seize the Daylight: The Curious and Contentious Story of Daylight Saving Time" the long tradition was first started by Benjamin Franklin as a way to conserve energy.
Franklin came up with the idea in 1784 so people could take advantage of the extra evening daylight rather than wasting energy on lighting.
