Every March, we lose one hour of sleep.
It doesn’t feel like much.
But research consistently shows that even a small disruption to sleep cycles can increase accident risk — especially in the days immediately following Daylight Savings.
When clocks “spring forward,” fatigue rises. Reaction times can slow. Focus can drop. And injury rates may increase — on the road, at work, and even at home.
Below, our friends at KBD Attorneys explain what happens after the time changes — and why it matters.
Does Daylight Saving Time Increase Car Accidents?
Yes — studies have found an increase in crashes in the days following the spring time change.
A 2020 study conducted by researchers at the University of Colorado Boulder found that the spring Daylight Saving Time (DST) transition increases fatal motor vehicle crash risk in the United States by approximately 6%.
The reason is simple:
Sleep deprivation affects driving ability in the same ways alcohol does.
Fatigue can cause:
- Slower reaction time
- Reduced attention span
- Poor judgment
- Increased risk-taking
- Microsleeps behind the wheel
Even drivers who feel “fine” may experience decreased alertness during morning commutes in the week after DST.
The National Highway Traffic Safety Administration has long warned that drowsy driving contributes to thousands of crashes each year. The time changes compounds that risk.
Why Losing Just One Hour Matters
Our bodies operate on circadian rhythms — internal clocks that regulate sleep and alertness.
When DST shifts that rhythm abruptly:
- Melatonin production is disrupted
- Sleep cycles shorten
- REM sleep may be reduced
- Morning alertness declines
For many people, especially shift workers, parents, and commercial drivers, this small disruption can last several days.
That fatigue carries into:
- Morning commutes
- School drop-offs
- Delivery routes
- Construction shifts
And the risk doesn’t stop at the road.
Workplace Accidents Can Increase After the Time Change
One of the lesser-known effects of Daylight Saving Time is its impact on workplace injury rates.
Some studies have observed:
- Increased workplace accidents in the week after DST
- Higher rates of injuries requiring medical attention
- Greater severity of on-the-job incidents
Industries especially affected include:
- Construction
- Transportation
- Manufacturing
- Healthcare
Fatigue reduces situational awareness — a critical factor in preventing machinery accidents, falls, and equipment-related injuries.
For employers, this means heightened safety awareness should accompany the time change.
For injured workers, it raises important legal questions about supervision, scheduling, and safety compliance.
Pedestrian & Bicycle Risks After Daylight Saving Time
While evenings become brighter, mornings become darker.
That shift affects:
- Early school commuters
- Morning joggers
- Construction workers
- Public transit riders
Reduced visibility combined with driver fatigue creates a dangerous overlap.
Drivers may be less alert during darker morning hours, and pedestrians may be harder to see.
This combination increases the risk of:
- Crosswalk accidents
- Bicycle collisions
- School zone crashes
The Overlooked Risk: Teen Drivers & DST
Teen drivers are particularly vulnerable after the time change.
Adolescents already experience delayed sleep cycles. Losing an hour of sleep can intensify:
- Morning drowsiness
- Inattention
- Slower reflexes
When you combine that with early school start times, the risk of fatigue-related crashes increases.
Parents often underestimate how significantly sleep loss affects younger drivers.
Commercial Drivers & Fatigue Liability
An experienced personal injury lawyer knows that fatigue is a major safety concern in trucking and commercial transportation.
The Federal Motor Carrier Safety Administration regulates hours-of-service rules designed to prevent drowsy driving.
However, the time change can still disrupt rest schedules.
If a commercial driver causes a crash after DST and evidence shows:
- Hours-of-service violations
- Inadequate rest periods
- Logbook discrepancies
The trucking company may face significant liability.
Fatigue is not a defense. It is often evidence of negligence.
Can Fatigue Be a Legal Factor in a Personal Injury Claim?
Yes.
Drivers have a legal duty to operate their vehicles safely.
If someone chooses to drive while dangerously fatigued and causes a crash, they may be held responsible for resulting injuries.
In severe cases — such as commercial driver fatigue — companies may also face liability for negligent supervision or scheduling practices.
Proving fatigue may involve:
- Phone records
- Work logs
- Surveillance footage
- Witness statements
- Electronic logging device (ELD) data
These cases require early investigation.
Injury Risks at Home After DST
Sleep disruption doesn’t just affect driving and work.
Fatigue also increases:
- Fall risk on stairs
- Kitchen accidents
- DIY project injuries
- Exercise-related strains
As daylight extends into the evening, more people begin home improvement and outdoor projects in March and April — often while still adjusting to the time shift.
Reduced focus + tools + ladders = increased injury potential.
How to Reduce Injury Risk After the Time Change
The days following DST require extra caution.
Consider:
- Going to bed 15–30 minutes earlier for several days
- Avoiding unnecessary early morning driving
- Taking breaks during long shifts
- Watching for pedestrians during darker mornings
- Delaying high-risk physical tasks if fatigued
Small adjustments can reduce risk significantly.
Frequently Asked Questions
Does Daylight Saving Time really increase accidents?
Yes. Research shows a short-term spike in crashes and workplace injuries following the spring time change, largely due to sleep disruption.
How long does the increased risk last?
For many people, elevated fatigue can last several days to a week as the body adjusts.
Can fatigue-related accidents lead to legal claims?
Yes. If a fatigued driver or employer fails to act responsibly and causes injury, they may be held liable for damages.
The Bigger Picture: A One-Hour Shift With Real Consequences
Daylight Saving Time was designed to adjust daylight usage.
But it also changes human behavior.
Fatigue affects judgment.
Judgment affects decisions.
Decisions affect safety.
Whether on the road, at work, or at home, the days following the time change carry measurable risk.
Understanding that risk — and acting cautiously — can prevent serious injury.