At 2 a.m. on Sunday, November 2, the observation of daylight saving time will end and the clocks will “fall back” to the standard time, 1 a.m.

Ever wonder why we change our clocks? While some think it is to give farmers an extra hour of sunlight in the evenings during warmer months, Daylight Saving Time was seen as a means to help reduce electricity use in buildings.

How much energy does Daylight Saving Time save? Researchers hotly debate this – but in 2008, Energy Department experts studied the impact of the extended Daylight Saving Time on energy consumption in the U.S. and found that the extra four weeks of Daylight Saving Time saved about 0.5 percent in total electricity per day. While this might not sound like a lot, it adds up to electricity savings of 1.3 billion kilowatt-hours — or the amount of electricity used by more than 100,000 households for an entire year. These electricity savings generally occur during a three- to five-hour period in the evening.

Click here to learn how you can save energy during Daylight Saving Time.

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