Twice a year, we adjust the clock and it often appears to wreak havoc on our sleep schedules and body clocks. Why does changing our clocks by one hour mess up our body clock? “Our body’s rhythms are ...

Waking up is hard enough. Waking up at the exact same time every day—even on weekends, when you could be luxuriating for another hour (or three) under the covers—can feel borderline unreasonable. Yet ...