Daylight saving time: When do clocks 'fall back' an hour?

Daylight saving time will end this weekend as scheduled, bringing sunsets before 5 p.m. to some cities. At 2 a.m. Sunday, clocks in 48 states will fall back one hour, giving back the hour taken in springtime.The change will give many an extra hour in bed and brighter mornings, but also earlier sunsets that will last through the winter.It comes amid an ongoing political tussle to make daylight saving time permanent.The House easily passed a bill in July to make daylight saving time permanent. It