Simpson and Mayhew, p. Drowsy driving is greatly underreported because there is no test for it, as there is for intoxication, no clear way to identify it, and many states don't even have a code for it on their vehicle accident reporting forms. Sleepiness and fatigue also play a role in crashes attributed to other causes. Sleep deprivation and fatigue make such lapses of attention more likely to occur. Twenty-seven percent reported that they had, at some time, fallen asleep while driving.
People are more likely to fall asleep on high-speed, long, boring, rural highways.
Large Canadian study cited in Don't Dial and Drive . Social, Cultural, and Political Perspectives . These are standard drink sizes. Of course, five ounces of a dessert wine contains more alcohol, as does a higher content beer or ale, or a distilled spirit higher than the typical 80 proof. The equivalent sizes for these drinks would differ from those of standard drinks, a fact that drinkers should keep in mind.