> He specifically differentiates between arguments and quarrels.

My experience was neither was impacted by any different resolution strategy. Also - with 5 kids, getting sleep was always the point.

Yes, he differentiates quarrels and arguments. He believes his wife is actually referring to a quarrel and and therefore her advice doesn't apply when it's actually an argument.

My aside is that I haven't found the advice to apply well to quarrels either.

Indeed. But the morning could find you smarter, in a better position to resolve the argument.

Sleeping on either quarrels or arguments could be good.