Why do we rehearse arguments that never happen? Because the brain cannot tell the difference between a problem that has been resolved and a problem that has been rehearsed to death.
You have done it today, probably. A conversation in your head with someone who was not there. You said exactly the right thing. They said something slightly unreasonable. You demolished it calmly. You won.
Nobody was listening. Nothing changed. And yet your heart was beating a little faster.
There is actually a word for this. Jouska. It describes the hypothetical conversations we play out in our minds, rehearsing what we will say, replaying what we should have said, running scenarios that may never come to pass. It was never in any dictionary until the internet made it clear that millions of people were searching for a name for something they did constantly.
The fact that the word had to be invented tells you something about how much time humans spend doing this.
Why Does the Brain Do This
The short answer is that your brain is trying to protect you.
When something feels unresolved, the mind keeps returning to it. Not out of masochism. Out of a genuine attempt to find closure, plan a better response, or prepare for a conflict that might still happen.
This is your default mode network at work. It is the part of the brain that activates when you are not focused on a task, when you are in the shower, walking somewhere, lying in bed. It runs simulations. It connects past events to future possibilities. It is, in a very literal sense, a rehearsal studio.
Most of the time this is useful. Athletes use mental rehearsal before competition. Surgeons run through procedures in their minds before making an incision. Before a difficult conversation, mentally preparing what you want to say is a genuine cognitive advantage.
The problem is that the brain does not automatically know when to stop rehearsing.
When Rehearsal Becomes a Loop
Here is where it goes wrong.
When the scenario involves a conflict that has not been resolved, or a confrontation you are anxious about, or something that was said to you that still stings, the rehearsal does not complete. The brain keeps running it because it has not received the signal that the problem is solved.
You feel like you are making progress. You are not. You are rewinding the tape.
Psychologist Susan David described it precisely: rumination is going over and over emotions in a way that does not arrive at any sense of insight. You feel like you are solving something. But the loop does not close because the loop was never going to close from inside your own head.
Research confirms this. People who replay and rehearse unresolved conflicts do not feel less anxious afterward. They feel more anxious. The rehearsal activates the same stress response as the actual confrontation, without any of the resolution that an actual conversation might produce.
The Anxiety Behind the Script
There is something else driving this that is worth naming.
A lot of argument rehearsal is not really about the argument. It is about anxiety.
When you are anxious about how someone perceives you, or whether you handled something badly, or what might happen in an upcoming conversation, the mind reaches for a sense of control. Rehearsing gives you a feeling of preparation. If I have thought through every possible thing they might say, I will not be caught off guard.
Research shows that people with higher levels of social anxiety spend significantly more time mentally rehearsing interactions than people with lower anxiety. The brain is trying to eliminate the uncertainty by running every scenario in advance.
The irony is that it does the opposite. Running more scenarios does not reduce uncertainty. It generates more variables, more possible responses, more things that could go wrong. The rehearsal intended to calm the anxiety feeds it instead.
Why It Usually Happens at Night
You already know this. The arguments that never happened always seem louder at 11pm.
There are two reasons for this.
During the day, external demands pull your attention outward. There is always something else to focus on. The default mode network, where all this simulation happens, is suppressed when you are doing tasks that require directed attention.
At night, when there are no tasks, no demands, no incoming information, the default mode network runs freely. Whatever was unresolved during the day gets its turn. The conversation you half-processed in the car on the way home becomes a full production at midnight.
Sleep deprivation makes this worse in a specific way. When you are tired, the prefrontal cortex, which is responsible for regulating and redirecting thought, becomes less effective.
The part of your brain that would normally interrupt the loop and say this is not useful, move on is running at reduced capacity. The loop continues longer and feels more urgent than it actually is.
What to Do About It
There are things that work and things that feel like they work but do not.
Writing the argument down works significantly better than replaying it in your head. The act of externalising the thought forces it into a linear structure, which gives the brain the sense of completion it was looking for. It does not have to keep returning to the scenario because the scenario now exists somewhere outside the mind.
Switching from first person to third person also interrupts the loop. Instead of thinking about the situation as I, using your own name creates enough psychological distance to access a more objective perspective. This is not a self-help trick. It is the same research-backed technique that athletes and surgeons use to manage performance anxiety.
What does not work is trying to resolve the argument inside your head by running it more. The closure the brain is seeking does not come from the simulation. It comes from either having the actual conversation, genuinely accepting that the situation is not resolvable, or making a concrete decision about what to do next.
The loop continues because none of those three things have happened.
The Useful Version
Not all of this is bad.
When the rehearsal is genuinely preparatory, when you are about to have a difficult conversation and thinking through what you want to say and how you want to say it, that is inner speech being used exactly as it was designed. The pillar article in this series on why we talk to ourselves explains in detail why this kind of mental preparation is a genuine cognitive advantage.
The distinction is whether the rehearsal is moving you somewhere or cycling in place.
If you are preparing for a real conversation, it is useful. If you are relitigating a conversation that already happened, or rehearsing a confrontation that probably never will, the brain is running a simulation that cannot complete.
The most useful thing to know is this. The argument in your head is not a problem you are solving. It is a feeling you have not yet processed.
Find the feeling. The argument will have less reason to keep running.
Read next: Why Does Nostalgia Feel Bittersweet? The Science Behind the Ache
