Tonight, while most of us are sleeping, time will spring forward.
At 2 a.m. Sunday morning, daylight saving time begins, moving our clocks ahead one hour and costing us an hour of sleep.
Daylight saving time has changed in the past few years. Though we used to spring forward on the first Sunday in April and fall back on last Sunday in October, Congress changed the date several years ago, adding more daylight saving time to the calendar. This year, it will run from March 11 until Nov. 4.
