Asleep at the wheel?? I do it all the time! I drive a big rig for a living and on those long lonely streches of highways I'll drive by brail. I'll get 30-60 second naps in before the truck hits the rumble strips

! Hey, c'mon, I'm just kidding!!! I have seen plenty of interesting looking tire tracks in the highway medians over the last 15 years driving the open road. The most amazing one (and I wish I went back to take a picture) was on I-5 going south before Buttonwillow, CA. The highway curves the the left and saw tire tracks going straight out into a field and amazingly right between the legs of those huge power line towers.
I concur what Mr. Ed says, too. When your travelling between diferrant time zones and working a demanding work schedule, it's hard to get a good nights sleep. But, I'm kind of furtionate in a way that most of the time I'm in no hurry to get the rig from point A to point B. So when I feel a tired, I find the next place to park and take a nap! Plus I have a hard time sleeping at a few of the hotels our company puts us up in.
Anyway, safe flying and driving to all!!