One in five accidents on major roads is caused by sleepy motorists, says the Government - and it's launching a campaign to do something about it.
The campaign coincides with the results of a survey by YouGov, which show that just 18% of drivers pull up for a rest after yawning at the wheel.
The poll also revealed that:
• Only 22% of drivers plan breaks into their journeys;
• 26% of drivers admit to having driven for more than four hours without taking a break;
• 4% admit to having driven for over seven hours without taking a break.
Road Safety Minister Jim Fitzpatrick said: 'Being tired at the wheel is a proven killer. People who drive for work are particularly at risk, but there are simple steps we can all take to make our journeys safer.
'Plan regular stops into a long trip, and if you find yourself yawning, pull over and take a break - this could make the difference between life and death.'
Dr Neil Stanley, a sleep expert from the Clinical Trials and Research Unit at the Norfolk and Norwich University Hospital, said: 'Yawning quite simply means you're on the road to falling asleep - so if you're yawning behind the wheel, it really is time to pull over.'