Spinninreel said:Driving tired can be compared to driving under the influence, because your reaction time is slower, your vision can be impaired, so the best advice is to not do it and plan your trip accordingly.
safety first, always. if you're in the middle of the freeway, and you're not even close to a rest area/service center, best thing to do would be to pull over and rest -- if an officer approaches you, he/she would understand the situation.