Almost half of young drivers risk their lives by driving exhausted after partying all night, a new poll shows.
And a third of men of all ages admit to driving for up to six to eight hours without a break, the survey from drinks company Lucozade found.
Also, 18 per cent of over-55s have fallen asleep while at the wheel, with one in seven resorting to pulling over on to the hard shoulder to take a nap.
Based on responses from 1,363 adults, the survey showed that 49 per cent of 17 to 24-year-olds have driven after staying out all night.
In addition, half of passengers in this age range have feared their driver was too shattered to be on the road.
Lucy Colman, from Lucozade, said: "Everyone knows that driving while tired is a very real danger. We have found that many drivers are not aware of the Government's guidelines and even plan to drive up to eight hours without stopping."