21 behind us, and Daylight Saving Time is ahead of us. Within most regions of the U.S., clocks are adjusted one hour ahead during summer months and then adjusted back an hour during the winter months.

We have trillions of body clocks — a central one in the brain and others in each cell of our body. Here's how they work with light to control our health. Exposure to light is crucial for our ...

Copyright 2025 The Associated Press. All Rights Reserved. Los Angeles Clippers guard John Wall dribbles during an NBA basketball game against the Denver Nuggets ...