That means clock confusion is once again ticking away, giving rise to hotly debated questions: Why do we spring forward and fall back? Does daylight saving time (DST) really save energy? Is it bad for your health? Here are some answers from the experts.

For most Americans daylight saving time will end with a "fall back" to standard time on Sunday, November 3, at 2 a.m. Most states "sprang forward" an hour to begin DST on Sunday, March 10. (Read about the start of 2013 daylight saving time.)

But the federal government doesn't require U.S. states or territories to observe daylight saving time, which is why residents of Arizona (except for residents of the Navajo Indian Reservation), Hawaii, Puerto Rico, the