You can create a clear boundary around work and still find yourself lying awake at eleven, replaying the same conversation.

This is where switching off becomes difficult for many people, so it helps to understand what is actually happening. Going over something in your head can feel like problem-solving, which makes it hard to let go. Leaving something unresolved can even feel irresponsible. But if you look closely, you may notice that you are repeating the same thoughts without new information and without reaching a decision.

That is not productive thinking. It is a mental loop, and it can keep your mind and body in work mode long after the day has ended.

The goal is not to force yourself to stop thinking about work. Trying not to think about something often has the opposite effect. A more useful approach is to give those thoughts a specific time and place.

• Choose a time. Set aside about fifteen minutes earlier in the evening, not in bed and not immediately before bedtime.
• Write it down. Instead of continuing the conversation in your head, write down what is actually unresolved and what the next concrete step could be.
• Stop when the time is up. You do not need to solve everything. The aim is simply to move unfinished thoughts out of your head and into a place you can return to later.
• If the thought returns later, remind yourself that it is already written down and has a next step. That gives your mind a clearer reason to leave it until tomorrow.

Why can writing help more than continuing to think? A worry that stays in your head has no clear boundaries. It can grow, repeat itself and become mixed with other concerns. Once you write it down, it becomes more specific and often easier to understand. The relief does not necessarily come from solving the problem, but from seeing clearly what the problem actually is.

If the thought is about a conversation you are worried about, write down the first sentence you would like to say. You do not need to plan the entire conversation. Often, getting clear on how to begin is enough to reduce some of the mental repetition.

There is one more distinction worth noticing. If the thoughts are less about work itself and more about you, for example, that you are failing, that you are not good enough or that things will never improve, that is a different pattern. It may be worth returning to Lesson 4 and reading it again.