Here's what you should do if you feel drowsy while driving, according to a Chevy safety engineer who saw the danger of tired driving firsthand when serving in Iraq

Her advice is to get adequate rest or pull over when sleepy — don't try to push through with coffee.

It was there that — in addition to building fortifications, schools, and roads — she experienced firsthand the dangerous effects of driving without enough sleep. Short left the Army as a Captain and did a doctorate in situational awareness at Texas Tech, and along the way she worked with the military to understand the importance of sleep and recovery.

"About 40% of people have fallen asleep when driving," Short said."And 20% of fatal crashes involve distracted driving. We're all trying to do more, and we're getting less sleep."

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