"Sleeping on it never solves anything"

Some readers will say they've tried this. Slept on it, woken up, and the row was still there. Sleep didn't solve it. So the old rule was right, and the only thing that solves a row is having it.

Sleep doesn't solve arguments. Rested people do. The claim was never that you'd wake up with the dishwasher sorted. It's that you'd wake up with the two people who can sort it, which is different from the two people on the sofa at one, and chapter 6 is about how.

Walker and van der Helm's model from chapter 4 is about what sleep does to the charge on an experience, not to its content. The row is still there in the morning. It's less raw. The thing from March is still a thing, but it's the size it is rather than the size it was at half past twelve, and a thing the right size is a thing two people can talk about in ten minutes.

There's a finding from an earlier book in this series that applies here. Eli Finkel and colleagues, in 2013, found that couples who spent twenty-one minutes over a year writing about their conflicts from the view of a neutral third party who wanted the best for both of them stopped showing the decline in marital quality that other couples showed, and the mechanism was reduced distress about conflict. The earlier book calls that view the third seat. What's worth noticing here is when the third seat is available. Not at one in the morning. The flexible perspective-taking that lets you see the row as a fond outsider would is exactly the kind of thinking Killgore's review said sleep loss degrades. At eight, after sleep, you can take the third seat. At midnight you can only take yours.

So "sleeping on it never solves anything" is true about the sleep and false about the morning. The morning has two rested people and a third seat in it. The night had two exhausted people and a circuit. If you've slept on rows before and found them unsolved in the morning, the missing piece was almost certainly chapter 17's, which is that nobody set a time to come back to it, and a row slept on with no time attached isn't slept on. It's dropped, and dropped things do come back, and that's not sleep's fault.