Not defending the GP but there are plenty of occasions where it’s unavoidable for some people to drive tired. Like families with young children and where adults don’t have the luxury of working from home nor good public transport links. Are they supposed to book a day off every time their child doesn’t sleep?

But there are also measures one can take to mitigate tiredness while driving: winding the window down or turning the AC down, putting energising music on, stopping mid-journey and taking a break, etc.

There are also medical conditions one can have where they can fall asleep even when not tired. However I believe you’re denied a licence if you do suffer from any of them so this might well be a moot point.

> turning the AC down

Wouldn't you want to turn it up? You're less likely to fall asleep if you're cold.

Yeah, I mean temperature rather than electronically. Though in the climate I’m from both would generally lead to the same drop in cabin temperature.

Demonstrably untrue.

Monotony can make you drowsy, regardless of how healthy you are or how much sleep you've had. And when this happens, it can catch you unawares even if you're looking for it.

True. But then wouldn't you want to take a break, or have your software/whatever notifying you to take a break prior to falling asleep?