Just an anecdote but on a subreddit I sometimes browse there's two MDs who boast of sleeping only 3 hours per day.
And then on the financial incentives side of things, at this point practice insurance might be so robust that it might not be so risky any more to end up committing a medical error while working those extra 3 to 4 hours per day might mean you're making enough money to retire in your early 40s.
And then on the financial incentives side of things, at this point practice insurance might be so robust that it might not be so risky any more to end up committing a medical error while working those extra 3 to 4 hours per day might mean you're making enough money to retire in your early 40s.