Staying Healthy

The dark side of daylight saving time

Why can an hour’s time change in spring disrupt our body, sleep, and mental health?

By , Executive Editor, Harvard Men's Health Watch

photo of a man awake in bed, unable to fall asleep

On March 12, most Americans will observe the start of daylight saving time (DST) and "spring forward" by setting their clocks one hour ahead. (The exceptions are people living in Arizona and Hawaii.)

DST lasts from mid-March until early November when the clocks turn back an hour and return to standard time. During DST, people can enjoy more time in the sunlight in the evenings. But that convenience comes at a price.

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About the Author

photo of Matthew Solan

Matthew Solan, Executive Editor, Harvard Men's Health Watch

Matthew Solan is the executive editor of Harvard Men’s Health Watch. He previously served as executive editor for UCLA Health’s Healthy Years and as a contributor to Duke Medicine’s Health News and Weill Cornell Medical College’s … See Full Bio
View all posts by Matthew Solan

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