"Clock changes can throw you for a loop. Even a one-hour shift, as happened in most of the US on Sunday, can leave you feeling groggy and out of sync for days. That's because your body's internal clock-your circadian rhythm-relies on daylight, meal times, and a steady routine. When the country's twice-yearly time change comes along, it disrupts that rhythm and leaves your body playing catch-up."
"In the US, most of the country switches between standard time and daylight saving time (DST) in November and March. Standard time is the "normal" clock time used in the fall and winter, while DST is the one-hour shift in spring and summer that shifts daylight from morning to evening. Each year, clocks spring forward one hour in March, and we lose an hour of sleep."
One-hour clock shifts can leave people groggy and out of sync for days by disrupting the circadian rhythm, which relies on daylight, meal times, and a steady routine. Simple habits and gradual adjustments can help reset sleep schedules naturally after a time change. In the United States, most areas switch between standard time and daylight saving time in November and March, moving daylight from morning to evening. Daylight saving began in World War I to save energy and was intended to aid farmers, but it often complicated farming schedules. Hawaii and most of Arizona do not observe the change.
Read at WIRED
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