• By Deb Balzer

Mayo Clinic Minute: Daylight saving time ends Nov. 1

October 29, 2020

Daylight saving time ends on Nov. 1 in the U.S. and Canada, meaning clocks are set back one hour. But does gaining or losing an hour of sleep affect a person's health? 

The spring forward, fall back seasonal time change can disrupt the body's biological clock, says Dr. Lois Krahn, a Mayo Clinic sleep medicine expert. 

Watch: The Mayo Clinic Minute

Journalists: Video (0:59) is in the downloads at the end of this post. Please "Courtesy: Mayo Clinic News Network." Read the script.

The human brain has a circadian or biological clock that runs on a 24-hour cycle. 

"Humans do best if our schedule is consistent, and we go to bed at the same time and get up at the same time each night, day after day, because that's when our clock is really optimized," says Dr. Krahn.

The clock change from daylight saving time to standard time can affect a person's ability to concentrate or pay attention to detail.

"Studies done on different continents show that the rate of motor vehicle accidents increases after the clocks change in many different parts of the world," says Dr. Krahn.

Along with a clock change comes less sunshine. If you struggle with darkness, Dr. Krahn suggests turning on the lights when you first wake up and consider a light box

Getting exercise is another way to adjust to the change, says Dr. Krahn.

"Exercise helps signal to the body that it's time to get going in the morning. Also, live as healthy a lifestyle as possible." 


For the safety of our patients, staff and visitors, Mayo Clinic has strict masking policies in place.  Anyone shown without a mask was either recorded prior to COVID-19 or recorded in a non-patient care area where social distancing and other safety protocols were followed.

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