Bad mints. Crunchy.
Regular carrots (long, small bites, chew well)
One shoe.
Slap your cheeks, shoulders, arms, feet, without loosing control of the vehicle.
Massage actively your limbs, torso before starting the journey.
Leave 5 minutes earlier and make a stop at a gas station/mc donalds/dunkin/etc and buy the cheapest item possible (1 pack of mints 1 pack of gum). getting up from the car, walking to store and back to car will wake you up. Make it a ritual.
Sing Along music. 60-70s Rock long albums especially. Do it in voices (Monday is MS. Doolittle, Tuesday is California Flower Dude, Wednesday is Rough Talk WoodMan, etc etc)
Anything with some rhythm but not relaxing.
Set goals.
10 minutes - that post on the right
20 minutes - that grey rock
...
40 minutes - uh ah, I'm getting close to that beautiful place called WORK.
Remember also: where you look is where you go!!!
Change your Pillow and Mattress. You are NOT sleeping well!
Source: seeing the sunset (or the mist) over the Smokies in the curves.