Evidence is mixed, and it does not show that daylight saving time (DST) causes a general rise in workplace injuries. A study of U.S. mining records found more injuries and greater injury severity on Mondays after clocks moved forward in spring. An Ontario workers’ compensation study found no increase in claims after either seasonal clock change. The distinction matters: the findings concern different populations, outcomes and time windows.
What happens after the spring clock change?
In spring, clocks move forward and people lose an hour on the clock. Barnes and Wagner analyzed U.S. National Institute for Occupational Safety and Health mining injury records from 1983 through 2006. They found that injuries were more frequent and more severe on Mondays immediately after the spring transition than on non-transition days. Their study also reported an average of 3.6 additional injuries and 2,649 additional workdays lost after spring phase advances; expressed as relative differences, the authors reported 5.7% more injuries and 67.6% more workdays lost. These are comparisons from the study’s mining data, not predictions for an individual workplace or worker. The PubMed record summarizes the studies; the full article reports the figures.
The sleep finding is a possible explanation, not proof
In a second study using U.S. Bureau of Labor Statistics time-use data from 2003 through 2006, Barnes and Wagner found that workers slept an average of 40 minutes less on Mondays after the spring transition. Reduced sleep could plausibly affect alertness, but the studies show an association; they do not establish that sleep loss caused the mining injuries. Barnes described the potential concern as an interpretation of the findings, saying that lost sleep “could have an impact” on workers’ ability to stay alert, rather than claiming causation. The APA’s 2009 statement attributes that comment to him.
What did the studies find after the autumn change?
The mining study found no significant difference in injury quantity, injury severity or sleep after the autumn return to standard time, when clocks move back and an hour is gained. Its reported injury increase was specific to the spring shift; it should not be described as an effect of both annual transitions. Barnes and Wagner’s study record summarizes this spring-versus-autumn distinction.
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Why another study found no increase
Morassaei and Smith examined Ontario Workplace Safety & Insurance Board claims from 1993 through 2007, comparing the week of each clock change with adjacent weeks. They considered both lost-time and no-lost-time claims. They found no increase in claims in the days immediately after the spring shift, and no evidence of an increase or decrease after the autumn transition. A decline later in the spring-transition week was attributable to years when Good Friday fell during that week. The PubMed record describes the analysis and findings.
This result does not directly disprove the mining study: one examined injuries in a specific industry, while the other examined compensation claims in Ontario using a different comparison period and outcome. Taken together, they make the evidence unsettled rather than universal. The mining result cannot establish that workers in every occupation face the same risk, and the Ontario result does not establish that no workplace could be affected.
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How to interpret the evidence
- Spring and autumn are different: the mining study found an increase after the spring time change, not the autumn return.
- The population matters: the increase came from U.S. mining records, while the null result came from Ontario compensation claims.
- The outcome matters: one study examined injury frequency and severity, including workdays lost; the other examined claim incidence.
- Association is not causation: the sleep result offers a plausible mechanism but does not prove that losing sleep caused injuries.
For a reader asking whether clocks springing forward can make work more dangerous, the careful answer is that one mining study found a concerning association, while a broader claims study in Ontario did not find a post-change increase. The available findings do not support a blanket claim that DST causes workplace injuries across industries.
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