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You’re lying there. Eyes open. The room’s quiet, your body’s tired and your brain is running a full post-mortem on every conversation you’ve had in the last 72 hours.

Did that message land wrong? Should you have said something different in the meeting? What if that silence meant something? What if they’re annoyed and they’re just not saying it?

You know none of this is useful. You know the loop is going nowhere. And somehow that makes it worse, because now you’re overthinking about the fact that you can’t stop overthinking.

It’s exhausting. And it is extremely common.

A YouGov survey found that 73% of 25 to 34-year-olds in the UK say they overthink regularly [1]. Deloitte’s 2025 Gen Z and Millennial Survey reported that 40% of Gen Z feel stressed or anxious all or most of the time [2]. In England, NHS figures show that 25.8% of 16 to 24-year-olds now meet the threshold for a common mental health condition [3]. Overthinking isn’t listed as a clinical diagnosis, but it sits right at the heart of the conditions that are: generalised anxiety disorder, social anxiety, depression.

This isn’t a personality quirk. It’s a pattern that grinds people down. And it tends to get louder the more you try to argue with it.

What overthinking actually is (and isn’t)

Overthinking isn’t careful analysis. It isn’t deep reflection. It isn’t being thorough.

It’s your brain chewing the same thing over and over without arriving anywhere. Psychologists call it rumination when it’s focused on the past and worry when it’s aimed at the future, but the mechanics are almost identical. You replay. You rehearse. You catastrophise. You circle. And nothing resolves.

Research by Ehring and Watkins identified this kind of repetitive negative thinking as a transdiagnostic process, meaning it cuts across anxiety, depression, insomnia and a range of other conditions [4]. It isn’t a symptom that belongs to one diagnosis. It’s a shared engine that drives several of them.

A landmark study published in Science found that people spend roughly 47% of their waking hours thinking about something other than what they’re currently doing, and that this mental wandering made them less happy, not more [5]. The default mode network, the brain circuitry most active when your mind drifts, tends to pull attention toward self-referential worry and social evaluation [6]. Left unchecked, it becomes a rumination machine.

Put bluntly, your brain’s autopilot setting isn’t calm reflection. It’s anxious rehearsal. And for a lot of people, especially at night, it runs almost constantly.

Why it gets worse at night

Ask anyone who overthinks and they’ll tell you the same thing. It’s worst after dark.

NHS England data from 2023 showed that 64.9% of young people aged 17 to 23 had sleep problems on three or more nights a week [7]. Among those with a probable mental disorder, the figure was 91.4% [7]. Research published in Frontiers in Psychology found that 83.1% of adolescents referred for anxiety treatment took half an hour or longer to fall asleep [8].

There’s a reason for this. During the day, you’re busy. Your attention is occupied by tasks, conversations, movement. The moment those distractions drop away, the default mode network takes over. And for people prone to rumination, that means the spiral kicks in precisely when they’re supposed to be winding down.

Allison Harvey’s research on pre-sleep cognitive activity found that people with insomnia didn’t just worry more at night. They worried differently. Their thoughts were more intrusive, more repetitive and harder to disengage from [9]. The bedroom becomes a stage for every unresolved concern of the day to perform in vivid detail.

So if your brain seems louder at midnight than it does at midday, that’s not weakness. That’s your default mode network doing exactly what it does when nothing else is competing for bandwidth.

What doesn’t work

Telling yourself to stop thinking about it. Obviously. But it’s worth saying, because most people’s first instinct when they’re stuck in a loop is to try to think their way out of it.

The problem is that suppression backfires. Daniel Wegner’s white bear experiments demonstrated this decades ago: when you actively try not to think about something, the monitoring process required to check whether you’re still thinking about it keeps the thought alive [10]. Suppression doesn’t reduce the frequency of unwanted thoughts. It increases it.

So does reassurance-seeking. Running the same worry past three friends, scanning Google for answers at 1am, mentally replaying the scenario from every conceivable angle hoping to land on certainty. None of it resolves anything, because the discomfort driving the loop isn’t rational. It’s emotional. And reasoning with an emotional response is like trying to negotiate with a smoke alarm.

What the evidence says actually helps

None of this requires a dramatic overhaul. The research keeps landing on the same handful of small, repeatable things.

Name what you’re feeling

UCLA’s affect labelling research found that putting feelings into words directly reduced amygdala activity [11]. When participants named their emotional state out loud, the brain’s threat-detection system quietened. Speaking engages language centres that compete with the fear circuit.

This is relevant for overthinking because the loop thrives on vagueness. “Something feels off” is fuel. “I’m anxious about tomorrow’s meeting because I don’t feel prepared” is specific enough to work with. Naming the feeling doesn’t make it vanish, but it shrinks it from a fog into something with edges.

Slow your breathing down

When you’re spiralling, your breathing typically goes shallow and fast without you noticing. That feeds the sympathetic nervous system, which feeds the anxiety, which feeds the thoughts. A systematic review in Frontiers in Human Neuroscience found that slow breathing at around six breaths per minute activates the parasympathetic nervous system and reduces anxiety [12]. A later meta-analysis confirmed that voluntary slow breathing strengthens parasympathetic control of the heart [13].

You don’t need a special setting. Four counts in. Hold for four. Four counts out. Hold for four. Two minutes of this can interrupt the cycle enough to loosen the loop’s grip.

Write it down

There’s a reason journalling keeps showing up in the research. Externalising thoughts breaks the loop because it shifts them from circular internal rehearsal to linear external processing. Pennebaker’s expressive writing studies showed that putting worries on paper reduced intrusive thinking and improved psychological wellbeing [14].

This doesn’t need to be eloquent. It doesn’t even need to make sense. The act of moving what’s in your head onto something outside your head changes the relationship you have with it. The thought stops being an alarm and starts being a sentence you can look at.

Reframe the thought

Cognitive Behavioural Therapy treats overthinking not by eliminating the thoughts but by changing how you respond to them. A meta-analysis of 41 randomised placebo-controlled trials found CBT effective for anxiety-related disorders [15]. Follow-up research published in JAMA Psychiatry showed that the benefits stick around well after treatment ends [16].

You don’t need a therapist in the room to try this. Catch the thought. Write it down. Ask yourself: is this fact or prediction? What would I say to a friend thinking this? Is there a version of this that’s more balanced than the worst-case reading?

The point isn’t to be positive. It’s to be accurate. “This will definitely go badly” is almost always less accurate than “I don’t know how this will go, but I’ve handled similar things before.”

Ground yourself in the room

When your head is three time zones ahead catastrophising about Thursday, grounding pulls you back into Tuesday. The 5-4-3-2-1 technique asks you to notice five things you can see, four you can touch, three you can hear, two you can smell and one you can taste.

It works because your brain can’t sustain a full-blown thought spiral while simultaneously cataloguing the texture of the chair under your hands and the hum of the fridge. The bandwidth just isn’t there.

Notice something good

Gratitude gets a mixed reaction, mostly because of how it’s been packaged. But strip the performative bits away and the research is reasonably clear. A meta-analysis covering 64 randomised clinical trials linked gratitude interventions to reduced anxiety and improved wellbeing [17]. A brief gratitude writing study during COVID-19 found it lowered stress and negative affect [18].

This isn’t about pretending the hard stuff doesn’t exist. It’s a deliberate, quiet counterweight to the brain’s natural tendency to scan for threats. One steady thing. One decent moment. That’s enough.

Small shifts, repeated

Overthinking isn’t something you fix once. It’s a pattern you gradually interrupt, one small response at a time.

The breath you slow before the spiral picks up speed. The feeling you name instead of sitting in a fog of unease. The thought you write down so it stops bouncing off the walls of your skull. The moment you pause and notice the room around you.

None of it is dramatic. Most of it takes less than two minutes. And over time, those interruptions rewire the habit. Not perfectly. Not permanently. But meaningfully.

A quieter way to start

We built MoodFire for moments like these. Not to cure overthinking, but to give you something concrete to reach for when your brain won’t stop circling.

Morning and evening mood check-ins built on affect labelling research. Breathing exercises shaped around parasympathetic activation. Reframing prompts rooted in CBT. Gratitude reflections backed by clinical evidence. A grounding tool for when you need to land back in the present.

Because at 2am, when the ceiling’s staring back and the loop is three laps deep, you don’t need someone telling you to stop thinking. You need something small and practical that meets you where you actually are.

One breath. One check-in. One named feeling at a time.