The current March to November system that the U.S. follows began in 2007, but the concept of "saving daylight" is much older.

The switch from daylight saving to standard time offers a reprieve for those who need more sleep. Clocks fell back an hour on Sunday morning and many people may have enjoyed an extra hour of slumber.

Most of the U.S. switches from daylight saving to standard time tonight. That means most of us will get an extra hour of sleep, and that's especially good news for teenagers. More than 3 out of 4 high ...