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.