Why the time change affects you more than you think

Do you prefer standard time or daylight saving time? Do you like the time changes or would you rather pick one time and stick to it? Lastly, how does the time change impact your health?

These are the questions lawmakers throughout the nation are grappling with — and they were the questions asked in a recent study by the National Sleep Foundation. The results of the study indicate that Americans’ views of the time change often differ with the established research on the issue.

Most Americans don’t think their sleep, routines, or moods are affected by changing the clocks. In the National Sleep Foundation’s national, random-sample survey, over 70 percent of those in Daylight Saving Time-observing states said time changes in either direction aren’t a problem for them.

“We’re seeing gaps between what the public thinks and both published research and real-world observations of the clock change’s effects on health. Evidence has shown that changing the clock twice a year is detrimental to our circadian rhythm and overall health and safety, including cardiovascular events, mental health issues, and even traffic fatalities,” said Dr. Rick Bogan, Board Chair of the National Sleep Foundation.

Just one in four respondents would stick with the current system of two clock changes during the calendar year. Slightly more than half, fifty-four percent, of Poll respondents said they preferred year-round Daylight Saving Time, the “spring ahead” clock setting where time is moved forward by one hour. “It’s understandable why Daylight Saving Time is appealing, but it doesn’t fit our body clocks like Standard Time. This is an opportunity for us to continue educating the public on the role and importance of the science behind our sleep,” added Bogan.

According to medical experts, switching to permanent Standard Time would better align our bodies to daily sunrise and sunset which influences the natural sleep/wake cycles, also called circadian rhythm. Your body and brain work together in multiple ways to create and regulate this process, andย sleep can suffer when your body’s circadian rhythm is out of sync.

Most adults need between seven and nine hours of sleep, followed by 15 to 17 hours of being awake.ย 

For more information about circadian rhythm and other sleep health topics, visit

About the National Sleep Foundation
The National Sleep Foundation is a 501(c)3 nonprofit corporation dedicated to improving health and well-being through sleep education and advocacy. Founded in 1990, the NSF is committed to advancing excellence in sleep health theory, research and practice.ย thensf.orgย โ”‚SleepHealthJournal.orgย 

About the Sleep in Americaยฎ Poll
The Sleep in America Poll is the National Sleep Foundation’s premier annual review of current sleep topics. The Poll was first conducted in 1991 and has been produced since 2018 by Langer Research Associates. The full Sleep in America Poll findings, including methodology, can be found at