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Fresh air.
Brief pit stops where you get out of the car (maybe use the facilities) and take a quick stide around. Gets the blood moving a bit, unstiffens the limbs. It helps.
Also, pack light snacks, not the sugery stuff but something that will give you some energy longer-term.
Finally, I would save caffeine for when I'm really desperate to stay awake. It's a quick high, then a crash and that makes you feel worse.
Have a safe trip!
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