Daylight Saving Time and Mental Health: New Study Findings 2026

Daylight saving time and mental health may not be as closely linked as previously thought, according to a major international study. The research, which included two Swinburne University researchers, found only weak and inconsistent evidence that the clock change affects mental health, including rates of depression and substance abuse.

The study, published in the European Journal of Epidemiology, analysed 157 studies from 36 countries over a decade. It aimed to assess the broad impacts of daylight saving time (DST) on health and behaviour. While some effects like minor jet lag and slight mood changes were noted, there was no association with significant declines in mental health.

What the Research Reveals About DST and Mental Health

Dr Ben Bullock and Prof Greg Murray from Swinburne University were part of the international team. They examined evidence linking DST to various outcomes, including heart attacks, traffic accidents, and mental health issues. The findings challenge common assumptions about the time shift's negative effects.

"You'd think it would be quite an easy thing to study," Bullock said. "We know when the time's changing, we can do almost a natural experiment. The issue is not so much being able to do those studies, it's working out the causal mechanism."

While correlations exist between DST and changes in sleep or accidents, establishing causation is difficult. The study highlights the need for more rigorous research to understand the true impacts of DST.

Key Findings on Daylight Saving Time and Health

• Mental health: Only weak and inconsistent evidence that DST affects depression or substance abuse.
• Heart attacks: Some studies show a slight increase after the spring forward.
• Traffic accidents: Fatal accidents may rise slightly following the time change.
• Crime: Fewer crimes involving physical harm occur after the shift.
• Sleep: Minor jet lag-like effects are common but temporary.

Comparing the Effects of Daylight Saving Time

The table below summarises the evidence for various outcomes associated with DST, based on the study's review.

Implications for Public Health and Policy

The study's findings suggest that while DST may have some short-term effects on sleep and behaviour, its impact on mental health is not as severe as some claim. This is important for policymakers who debate the merits of continuing the practice.

For individuals, the message is reassuring: the time change is unlikely to cause lasting mental health problems. However, those who are sensitive to sleep disruptions should take steps to adjust gradually.

Tips for Adjusting to Daylight Saving Time

• Gradually shift your sleep schedule a few days before the change.
• Expose yourself to natural light in the morning to reset your circadian rhythm.
• Avoid caffeine and screens before bedtime.
• Maintain a consistent sleep routine.

FAQ

In conclusion, while daylight saving time may cause minor disruptions, the evidence does not support significant mental health impacts. The study calls for more research to understand the causal mechanisms behind the observed correlations.

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