"It needs me"

The problem's not finished. It was half done when you left, and some part of you believes that if you stop holding it, it'll get worse. Not in any way you could explain. But leaving it feels like leaving a pan on the hob. If you're not watching it, something will burn.

The pan is a fair picture of the feeling and a poor picture of the problem. The pan is on the heat. The problem isn't. Nothing happens to the spreadsheet between six in the evening and half past eight tomorrow. The email that needs a decision doesn't change while you're not deciding. The meeting that went badly at ten past three has finished going badly and will not go worse overnight. The watching isn't keeping anything from burning, because nothing's on.

What the watching is doing is answering an itch, and the itch has been studied. Christine Syrek and colleagues followed 59 employees over twelve weeks, matching what they reported on Friday afternoons with how they slept at the weekend. Unfinished tasks at the end of the week predicted worse weekend sleep, and the route was the fret, going over the open things, not the working-out. People who did the working-out about their open tasks slept a little better, if anything. The researchers were drawing on an old idea called the Zeigarnik effect, which is the observation that unfinished things stay in mind more than finished ones. The task being open is what keeps it in your head. Your keeping it in your head does nothing for the task.

So the feeling that it needs you is real and misdirected. It's the feeling of an open loop. The loop is what wants closing, and there are two ways to close it. One is to finish the task, which you can't do at the kitchen table. The other is to give the loop somewhere to sit that isn't your attention, which you can. Chapter 18 is about that, and the short version is that a loop written down on paper, with the next step named, goes quiet in a way that a loop held in the head doesn't. Syrek's team found the same pattern over three months as over a weekend. More open loops, worse sleep. The answer isn't fewer loops, because the job will always have some. It's where they're kept.

There's an honest objection here, which is that some problems do need watching. A server that might fall over, a patient, a deal that could move tonight. If that's your job, chapter 24 is for you, and the answer there is a different one. But be honest about whether your passenger is that kind of problem or the ordinary kind. Most of the reruns and most of the frets are about things that will be exactly where you left them in the morning. They don't need you. They need the morning.