You leave the office—physically or by closing the laptop—and arrive in the next part of your day. Dinner, a child, a partner, a run, a quiet hour. But work does not leave with the same efficiency with which you left. Some portion of it remains active in working memory, processing in the background, surfacing uninvited: the unresolved email, the thing you said in the meeting, the project that is not in good shape, the question that has no answer yet.
Sophie Leroy called this attention residue. The concept, developed in the context of task-switching within the workday, applies equally—arguably more acutely—to the transition between work and the rest of life. When you leave a task incomplete or in an uncertain state, your brain does not file it cleanly. It keeps it open. Incomplete tasks exert a pull on working memory, a phenomenon observed by Bluma Zeigarnik in the 1920s and confirmed repeatedly since. The pull does not respect the boundary between work time and personal time. It continues.
This is the mechanism by which work colonizes home. Not through formal overtime, not through the employer's explicit demand, but through the residue. You are physically present at dinner but not fully there. You are in the conversation but part of your processing is still in the office. Your partner speaks and you hear the words and register that you should respond and somewhere behind that you are running the open loop about tomorrow's deliverable. The conversation you have is the version available under divided attention. It is not the conversation you are capable of, and the people in the room with you can often tell the difference even when they cannot name what is missing.
Law 2 identifies this as an attention reclamation problem. The reclamation does not happen automatically at 5 PM or whenever the workday nominally ends. It requires active intervention—something that closes the open loops, signals to the cognitive system that the work context is genuinely suspended, and creates a boundary that attention residue cannot easily cross.
The research on this is clear enough: the transition out of work is not instantaneous, and organizations that normalize open-ended availability—the late-night message that is sent without urgency but received with implied urgency, the expectation that you are reachable across all waking hours—are actively degrading the quality of their employees' non-work time and, by extension, the employees themselves. Recovery is a real variable. People who recover fully between work periods perform better in them than people who do not. Attention residue that bleeds into home life degrades home life and returns to work the next day as a person who has not fully recovered.
The practical response is the deliberate transition: a ritual that closes the work day in a formal enough way that the brain registers it. Writing the next day's plan, physically leaving the work space, a walk, a defined activity that requires enough presence to crowd out the residue. None of these are magic. They are the available tools for a problem that does not resolve itself.