This is a good question. As a OTR driver (ret) i found that if i was driving across Nebraska I would be super sleepy within the first hour, and here's the kicker, it would only happen when I was headed west bound, east bound i was fine.
My friend a fellow truck said that it was probably because sub consciously pre programed my brain to be bored and so my brain would basically just shut down to conserve energy.
Aug 22, 2016 Rating
heavy eyes by: Anonymous
too much coffee.
Mar 21, 2016 Rating
Is it just when driving by: Hervy
You might want to get your thyroid checked out. I was also wondering if it only occurred when you drive?