Interesting.Thanks!
Fairly big obstacle to colonoscopy is the inability to drive for until the next day.
It turns out this specification evolved when the sedative used was not Propofol, which is used today. And driving skill tests have been given to a random trial before Propofol. And then again after consciousness re-acquired.
It was found nearly all people have their driving skills return to pre Propofol levels at 2 hours after end of the sedation. But the rules will remain what they are for some time.
Note also it is essentially common in Europe to have colonoscopy with no sedation.