Facts and Stats
Yes, it is as dangerous, or more dangerous, than drunk driving
How to Stay Awake on the Road: Tips to Combat Drowsy Driving. Those are some reasonable ideas, especially the quick nap in the car or a stop with a little walk. If it's a frequent problem that you have, and you need to drive long distances often, you might persuade your doc to prescribe some low-dose amphetamine or adderal for the purpose. That's what truck drivers do. Call it "Driving Narcolepsy."
It is odd, isn't it, that when you arrive at destination you can feel just fine?