It also could harm your health. Darker mornings and more evening light together knock your body clock out of whack — which means daylight saving time can usher in sleep trouble for weeks or longer.

The average American workday now concludes at 4:39 p.m., a notable 42 minutes earlier than it did just two years ago when the ...

Seasonal clock shifts involve "springing" the clock ... But plenty of places around the world have opted out of it entirely. These include all of Asia, and most of Africa. Over the past 10 years ...