"Spring forward, fall back," is the mantra you need to remember this Sunday, Nov 4. Daylight Saving Time ends at 2 a.m. Sunday right, and you'll want to set your clocks back before you go to bed Saturday.

You will be setting your clock back one hour, following the adage of “spring forward, fall back.” The “extra” hour gives you a chance to catch up on the sleep you lost in March when the clocks moved forward and Daylight Saving Time began.

In an effort to save resources during World War II, the U.S. made daylight saving time mandatory for the whole country. And it was observed the entire year.

Some studies have shown that extending Daylight Saving Time results in a reduction in energy consumption; other studies suggest just the opposite.