I make it a habit to not drive if I'm drowsy. I will take a nap in the car if I have to (I've done it before). If I expect a few hours ahead of time that I may need to drive but may not be as alert as I'd like, I load up on caffeine. It usually works. When it doesn't, nap time. I started that habit when I dozed off for a second on the way home from a very very long day at work. Luckily no issues from it (didn't even leave my lane) but it put me in my place.
I try to remember that I could KILL someone else (and maybe their entire family?) if I drive while drowsy. I wouldn't want to be killed or have my family killed by a drowsy driver so I do what I can to avoid being that drowsy driver.
If only we could find a way to rid the roads of drunks.
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