Man sleeping in a bed with a grey upholstered bed frame.
Sleep Health

How to Prepare For Daylight Savings

  •  Purple Author Icon
    Last Updated
    March 1, 2023
    min read


    It’s almost daylight saving time (DST) again and being deliberate about your sleep has never been more important. Every March most of the U.S. and Canada observe Daylight Saving time. Turning Clocks back one hour, lasting until November.

    A Little About Daylight Saving Time

    DST was first instituted in the United States in 1918, but it was so unpopular that it only lasted for seven months before being repealed. During World War II, Franklin Roosevelt reinstituted DST under the title “War Time.” After the war, the United States kept DST, but it caused some confusion, with some states choosing to observe it and others choosing not to.

    It wasn’t until 1966 that Congress passed the Uniform Time Act to standardize DST across the country, with only Arizona and Hawaii opting out.

    How Daylight Saving Time Impacts Health

    You might be thinking “What harm can a one-hour adjustment to your routine do?” Well, a recent study linked the spring DST change to a 6% increase in the risk of fatal car accidents nationwide. Other studies have linked the time change to an increased risk of heart failure and depression.

    How Can You Prepare?

    Even if you’re getting the same amount of sleep as before, DST can leave you feeling unusually tired. This is because your body has a natural rhythm that tells you when to sleep and when to wake up, called the circadian rhythm. DST can misalign your circadian rhythm, making it difficult to get a restful night’s sleep, even after a full eight hours.

    To avoid possible negative effects, here are a few steps you can take:

    Adjust your bedtime: Start adjusting your bedtime by 15 minutes every other day. That way your body will be adjusted to the new bedtime just in time for the shift.

    For example, if you’re going to lose an hour on Saturday and you normally go to bed at 10 p.m., go to bed at 9:45 the preceding Monday, then 9:30 on Wednesday, and 9:15 on Friday. That way, the switch is easy! Note: Don’t forget to adjust your wake-up time accordingly.

    Get Light Exposure: Get out of bed and get light exposure as promptly as you can in the morning, preferably within 20 minutes of waking up and using natural light. This will help your body register the new wake-up time and allow your circadian clock to adjust more quickly. (We’ll talk more about why that is in later blogs).


    About the authors

    Purple Staff
    Connect with Purple —