Around one in 20 participants admitted they had dozed off
while driving at least once in a month and more than a third said they had
fallen asleep at least once in a day over that time period.
Drowsy driving has been responsible for an estimated 1,550 fatalities and
40,000 non-fatal injuries annually in the U.S.
The surveys conducted by the Behaviour Risk Factor Surveillance System asked
74,571 people in 12 states.