I've been working a lot of "peak hour" shifts while counting cars.
That means exactly what it says. We count during the peak hours. Which is 530am-900am, 1045am-100pm and 245pm-700pm. Yep that's 10 hours a day. With 2 breaks. And the day starts awful early. We have to be insure by 530am. So depending on the location I leave home between 400am and 430am. I thought the train was early!
I have become very adept at power napping in the car between sessions. For 45 mins I am out cold. Don't even try to wake me up. I like my sleep.