Daylight Saving Time shifts the clock by an hour each year. Learn why we observe it, when the clocks change, and how it can affect your sleep and body clock.

It's almost time to change the clocks again in most of the U.S.

March 8, 2026, marks the start of Daylight Saving Time for most of the United States. But unlike almost everywhere else, ...

Daylight saving time, where clocks are turned one hour ahead, is meant to save energy and capitalize on more sunlight during ...

The march toward daylight saving time has begun. With the month of March kicking off this weekend, marking the start of meteorological spring, the clocks will actually change earlier than recent years ...

Most biochemical reactions accelerate as temperature increases, but our daily circadian rhythms, which are underlain by gene regulatory and biochemical networks, remain constant, even as temperatures ...