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					Originally Posted by  DanaC
					 
				 
				 Many, many people drive when tired. I wuold imagine half the people commuting in a morning do so with a stifled yawn. 
			
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   just because lots of people do it doesn't make it not dangerous.  That said, I feel that stifling a yawn requires little cognitive effort, but playing tricks on yourself to keep your eyes open requires concentration that should be being used on the driving and also suggests that the eyes are open but maybe not communicating with the brain as much as required for driving.
People often overlook tiredness as a danger when driving.  Yup, I'd rather you were tired than drunk or texting.  Right until that point when you finally lose your concentration game and t-bone me. And there's no legislation that can be made to prevent people from driving when they are too tired.  And if it isn't illegal, some people will continue to think it's not unsafe. And I only hope that it's a tree they hit and not another vehicle when they finally do mess up.