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Analysis of more than 3,000 business drivers using RED Driver Risk Management’s Wellbeing Profiler has shown they suffer from more anxiety, stress, tiredness and mental health issues between November and February than at any other time of the year.

RED said ‘Seasonally Affective Driver Disorder’ (SADD) affects all types of business drivers, whether they are in a company car, delivery van or HGV, and results in the potential for higher risk and lower productivity.

The combination of dark mornings and nights, winter weather and harder driving conditions, plus an increase in stress levels as the festive season approaches, is a factor in the marked spike in mental health issues.

A fifth of drivers (20%) claimed to feel tired during the winter months, and for some the issue is worse still, with 12% claiming to be ‘exhausted’.

Another 10% say they experience anxiety during the darker days.

RED also reported an 8% drop in the number of employees feeling motivated, while the percentage of drivers feeling ‘very discouraged’ doubles and ‘enthusiasm’ wanes by nearly 10%.

RED Driver Training’s chief executive Ian McIntosh said: “We ask 79 different questions that look at areas such as tiredness, anxiety, employee engagement, mental clarity, decisiveness, self-esteem and lifestyle, and in every single metric there is clear evidence that drivers struggle more in winter than other seasons.

“Anybody who drives a lot knows that it can be especially tough during the winter. From the moment you get out of bed in the dark and have to scrape the ice off in the cold, we know that business motoring in the winter months is hard work.

“But this is the first time we have been able to definitively get a picture of the scale of it, through analysis of our Wellbeing data. It showed that around one in 10 business drivers suffer from some form of SADD-related issue during the winter months. That is a lot of employees who are struggling, and need help.”

Meanwhile data from RoSPA shows that collision rates increase by 19% in the fortnight after the clocks are turned back.

According to the NHS, the exact cause of SAD (Seasonal Affective Disorder) is not fully understood, but it is thought that a lack of sunlight might stop a part of the brain called the hypothalamus working properly, which may affect the production of melatonin, making you feel sleepy. Also, lower serotonin levels can affect mood, appetite and sleep, and shift the body's internal clock out of kilter.

“The fact that driving impacts more negatively on a person’s mental health during winter is another hurdle to overcome for those already experiencing tiredness or depression," McIntosh said. "Seasonally Affective Driver Disorder can result in more sick days being taken, reduced productivity and, of course, is a real danger too, exacerbating the risk of accidents."

He advised employers to reduce the mileage of their drivers by doing more video-conferencing, or reschedule appointments so they are not doing long drives in the morning or evening when the risks are higher.

“We measure overall resiliency and drivers’ scores improved on average by 19.72% after training," he added. "But more interestingly those that kept going and continued with the programme for more than four months, improved on average by an impressive 30.54%, meaning they were much more able to combat the feelings of fatigue, stress and anxiety.

“Companies are far more aware of the need to support those employees struggling with mental health, and those tucked away in their cars and vans, often alone for hours on end every day, should not be forgotten."