Daylight Savings Time: What It’s Costing Your Health

Posted by on March 5, 2015 in Health, Prevention with 0 Comments

Dr. Mercola

For Americans, it’s that time of the year again—time to move your clocks an hour ahead; losing a precious hour of sleep in the process. For many, the time change associated with daylight savings time1 (DST) also means spending several days or even weeks feeling generally off-kilter.


As reported by Prevent Disease:2

A study, published in 2007… combined surveys from 55,000 people in central Europe with data on 50 individuals' sleeping and wakefulness patterns for eight weeks around the shifts to and from daylight saving time.

The researchers found people never fully adjust their circadian rhythms to the hour shift associated with daylight saving time (or, as it is known in Europe, summer time).

Springing ahead by an hour, however, was most difficult for night owls — people prone to wake up and go to sleep late, they found.” [Emphasis mine]

The issue of whether daylight savings time (DST) should be abolished comes up at regular intervals, and for good reason.

As explained in the featured video, daylight saving time is intended to give you more access to daylight hours, thereby reducing energy costs and promoting healthy outdoor activities, and for nearly a century countries around the world have moved their clocks forwards in the spring and backward in the fall.

But is it really worth it? There doesn’t appear to be any good reason for this time tinkering in today’s modern age, and a number of countries, and even regions within countries, have opted out of DST.

Areas that do not have DST include: the northern part of Brazil, Saskatchewan (Canada), large portions of Australia, Puerto Rico, the Virgin Islands, Hawaii, American Samoa, Guam, Northern Mariana Islands, and the state of Arizona.

Daylight Savings Time Is Rough on Your Health

The research is quite clear on the health effects of this meddling with time. In short, it’s not good for you, and spikes in both heart attacks3 and suicide4 in the days following daylight savings attest to the stark reality of such findings.

The adverse health effects of losing an hour of sleep when the clocks move forward—and the ripple-effect it causes for days and weeks afterward—are significant, and really highlight the importance of sleep for mental and physical functioning.

The “Monday cardiac phenomenon” has been recognized for some time.5 More cardiac events occur on Mondays than any other day of the week, and changes in sleep associated with the transition from weekend to work week may play a significant role.

When daylight savings gets added into the mix, this risk tends to become even more pronounced One 2012 study6 found that heart attacks increased by 10 percent on the Monday and Tuesday following the time change to DST. Heart attacks decreased by 10 percent on the first Monday and Tuesday after clocks are switched back in the fall.

According to the study’s author, Martin Young, Ph.D:

Individuals who are sleep-deprived weigh more and are at an increased risk of developing diabetes or heart disease. Sleep deprivation also can alter other body processes, including inflammatory response, which can contribute to a heart attack.”

An earlier study7,8 found a five percent increase in heart attack in the first three weekdays after the switch to DST. The risk decreased again after clocks were reset back to standard time in the fall.

Kazakhstan abolished DST in 2005, citing health complications as the reason for its decision. In 2011, Russia’s president Dmitry Medvedev also cancelled DST due to the “stress and illness” it causes on human biological clocks.9

Productivity Goes Down and Accidents Go Up in Days Following DST Change

Studies also show DST causes the entire country to take an economic hit from lost productivity. When you consider that this happens once every year, the cumulative effect on productivity is likely to be very significant.

According to Till Roenneberg, a German chronobiologist, your circadian body clock (which is set by daylight and nighttime darkness) never adjusts to the gaining of an “extra” hour of sunlight at the end of the day during daylight saving time. So you may actually remain slightly “off” for the entirety of the DST season.

“The consequence of that is that the majority of the population has drastically decreased productivity, decreased quality of life, increasing susceptibility to illness, and is just plain tired,” Roenneberg has said.10

Data11 from the US National Institute for Occupational Safety and Health also shows an increase in the number and severity of work-related accidents on the Monday following DST.

According to one 2009 study,12 workplace accidents and injuries increase by nearly six percent, and nearly 68 percent more workdays are lost as a result of injuries following the change to DST.

Ditto for traffic accidents, which rise by about eight percent on the Monday following the changeover to DST.13 Fatal alcohol-related traffic accidents increase for the first week after setting the clocks ahead.14

Daylight Savings, Does It Really Save Energy?

The origin for daylight savings time was rooted in the idea that it could save valuable resources. Ben Franklin appears to have been the first person to suggest the concept, after awaking at 6am one morning in Paris, realizing that the sun was already up well before him.

Getting up earlier and going to bed earlier, thereby using less oil to power lights, could save a lot of money, he reasoned. During World War II, the US mandated daylight saving time as a way to save wartime resources.

Alas, times have changed. At best, DST may save you a handful of dollars on your electric bill each year. At worst, you end up paying a lot more. According to Michael Downing,15 a teacher at Tufts University and the author of Spring Forward: The Annual Madness of Daylight Saving Time:

Daylight saving is… a boon to purveyors of barbecue grills, sports and recreation equipment, and the petroleum industry, as gasoline consumption increases every time we increase the length of the daylight saving period.”

Daylight Savings Might Be Jacking Up Your Energy Bill Each Year

According to the National Bureau of Standards, DST has virtually no effect on energy usage. A 2007 report by the California Energy Commission’s Demand Analysis Office16 also found that daylight saving time “had little or no effect on energy consumption in California.” But some studies suggest it actually wastes energy—and quite a lot of it at that. A story reported by the Wall Street Journal17 back in 2008 highlighted these findings. Up until 2006, only 15 of Indiana's 92 counties adhered to daylight savings time.

Following complaints from residents who struggled from being out of sync with businesses and friends in neighboring counties, the Indiana Legislature finally mandated daylight savings time be enacted state-wide. This presented economics researchers with an excellent opportunity to compare energy usage before and after adoption of DST, to see if and how much money was really being saved. As it turned out, the answer was none. In fact, DST cost Indiana residents millions of dollars in added energy costs each year! As reported by the Wall Street Journal:18

Using more than seven million monthly meter readings from Duke Energy Corp.  covering nearly all the households in southern Indiana for three years, they were able to compare energy consumption before and after counties began observing daylight-saving time. Readings from counties that had already adopted daylight-saving time provided a control group that helped them to adjust for changes in weather from one year to the next.

Their finding: Having the entire state switch to daylight-saving time each year, rather than stay on standard time, costs Indiana households an additional $8.6 million in electricity bills. They conclude that the reduced cost of lighting in afternoons during daylight-saving time is more than offset by the higher air-conditioning costs on hot afternoons and increased heating costs on cool mornings. “I've never had a paper with such a clear and unambiguous finding as this,” says Mr. Kotchen, who presented the paper at a National Bureau of Economic Research conference…”

So What Can You Do?

Let’s face it, as much as you and I may disagree with DST, there is little to no likelihood that our collective objections will do anything to stop it. So what can we do? My strategy, and the one that I strongly encourage you to adopt, is to seriously commit to getting the highest quality and longest sleep you can possibly get. For decades I prided myself on getting by on five hours of sleep or less. I gradually changed that to between six and seven hours, deluding myself into believing that because I was so healthy I could do it.

Finally by the time I hit 60, I began to realize that my perception of sleep was seriously distorted and that I need to carefully reevaluate it. Very similar to being unaware of the dangers of prolonged excessive sitting as being every bit as pernicious as not exercising at all. So in the past six months, largely as a result of feedback from my fitness tracker, I have been able to increase my sleep to 8.5 hours per night. I sincerely believe that using some type of sleep monitoring device, such as a fitness tracker, is the key to changing your behavior. For those concerned with the relatively insignificant amount of EMF they generate, there are monitors that sit on your nightstand that can monitor your sleep.

Since my regular sleep is about 8.5 hours, when I travel and am forced to cut back my sleep to five hours or so, I’m relatively insulated from the damage of intermittent lack of sleep. In some ways I suspect that our ancient ancestors never consistently slept 8-9 hours so, just like intermittent fasting, we likely do just fine with intermittent sleep disruptions. But I sincerely believe that it’s crucial to understand intermittent. I think sleep disruptions should be the rare exception when your personal circumstances limit you from sleeping the more ideal 8-9 hours. Many recent studies have s shown that one of the most potent improvements in professional athletes was merely increasing their sleep by one to two hours, which allowed their bodies to get more full recovery.

Sleeping Well Is Critical for Good Health

Sleep problems are epidemic in the US, both among kids and adults.


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