I plan things out pretty good, but one time I worked a really long shift (for me). We started at 7 PM, it was an hour drive from my house and I don't do well sleeping in the daylight. It was on an interstate highway job and we got off the road at 11 AM.
I got as far as the rest stop and caved in. I looked like hell when I stopped, and an hour later I was OK to drive but my eyes, the googles they did nothing! They looked like a couple of burning coals. I was glad I did not get stopped I would have had every drug test thrown at me. 😛