Have you ever thought about the possibility that daylight saving time might actually be dangerous? When the clocks spring forward and fall back each year, although only by an hour, research suggests it may take days to adjust to the time difference.
And during that adjustment period, there is a spike in car crashes, especially after we spring forward and lose an hour of sleep, as of recent. Some police departments say there’s about a 10 percent increase in crashes just after the time change and there’s even evidence that figure might be much higher.
Researchers at the University of Colorado at Boulder studied the daylight saving time period (from March to November) for 10 years and discovered there was a 17 percent increase in traffic incident-related deaths the Monday after the springtime change. Traffic fatalities all that week were also higher than average. Some of the effects can be attributed to lower visibility (the fact that it’s earlier, and therefore darker, than drivers are accustomed to), but most of the accidents, experts say, are because people are struggling to stay awake behind the wheel.
The traffic statistics alone seem like pretty conclusive evidence that daylight saving time is more than a mere inconvenience. Studies show the increased risk persists for the first six days of daylight saving time.
According to the 2016 Traffic Safety Culture Index by the AAA Foundation for Traffic Safety, nearly all motorists (95.9 percent) viewed drowsy driving “as a serious threat to their safety and a completely unacceptable behavior.”
But the report found that about three out of 10 motorists admitted to having a hard time keeping their eyes open while they were driving in the first month after the spring forward time because they were so tired.
This may just be scratching the surface of how our bodies actually process the disruption. People who only sleep four or five hours a night under normal circumstances are at a much higher risk of causing a car crash than people who sleep six or seven hours a night, and people who get eight hours of sleep or more are least likely to cause a crash. But when sleep cycles get disrupted, everyone gets messed up.
Although most research tends to focus on the “spring forward” period, when we lose an hour of sleep, experts say that the “fall back” period also has negative and dangerous effects, despite the extra hour gained, because the sleep cycle is still significantly altered. As long as daylight saving time remains the national standard, there’s not much that can be done about these effects. Experts suggest being proactive: go to bed a little earlier during the adjustment period, look out for signs of drowsiness while driving and pull over to rest, if necessary.