A number of people using roads in the UK could be suffering from a sleep disorder without knowing it, according to a car insurance firm.
Esure cites NHS Direct research which found that more than one in 100 people suffer from obstructive sleep apnoea-hypopnoea syndrome (OSAHS).
It adds that it is on the rise by 35 per cent, largely down to alcohol use and obesity.
Dr Chris Idzikowski, director of the Edinburgh Sleep Centre, commented that people should look for treatment if they believe they have the problem.
"OSAHS is on the rise and the fact that it affects so many UK drivers without them realising it, is concerning. Drivers should check for symptoms of OSAHS and be extra vigilant when planning long drives," he said.
This comes after research from road safety charity Brake and Green Flag found that one in ten people who drive as part of their job have fallen asleep behind the wheel.