You lie down exhausted, and your mind switches on. The day replays itself. Tomorrow’s worries arrive early. You watch the clock, calculate how little sleep you’ll get, and feel your chest tighten — which, of course, makes sleep even less likely. If this sounds familiar, you are caught in one of the most common and most misunderstood patterns I see in my clinic: the loop between insomnia and anxiety.
For many exhausted UK adults, it is genuinely hard to say which came first. Did the worry ruin the sleep, or did months of broken sleep leave you feeling permanently on edge? The honest answer is that it rarely matters, because once the two are locked together they reinforce each other night after night. The good news is that you don’t have to untangle which is the chicken and which is the egg. You can treat the loop itself.
The two-way street between insomnia and anxiety
Sleep and anxiety have what researchers call a bidirectional relationship. Poor sleep makes us more anxious, and anxiety makes it harder to sleep — each one is both a cause and a consequence of the other. This isn’t a vague impression; it shows up clearly in the data. Among people with insomnia, somewhere between a quarter and a third also meet the criteria for an anxiety disorder, and among people with anxiety, disturbed sleep is one of the most common complaints of all.
What this means in practice is that treating one side of the loop tends to help the other. When sleep improves, anxiety usually eases — and studies suggest that the improvement in sleep is part of why mood and worry get better, not just a happy coincidence. That single fact reshapes how we approach treatment.
Why anxiety makes it so hard to switch off at night
Anxiety is, at its core, a state of heightened alertness. Your nervous system is scanning for threats and keeping your body primed to respond. That is a brilliant survival system when there is a real danger in front of you — and a disaster when you are simply trying to fall asleep.
At bedtime, this shows up in familiar ways:
- Racing thoughts — the mind speeds up the moment there are no other distractions.
- Physical tension — a fast heartbeat, shallow breathing, or a knot in the stomach.
- Clock-watching — checking the time and doing anxious sleep maths.
- Anticipatory dread — worrying about not sleeping before you’ve even got into bed.
That last point is crucial. Over time, the bed itself can become a trigger. Instead of associating it with rest, your brain learns to associate it with the frustration and fear of another sleepless night. This is why so many people feel drowsy on the sofa and then suddenly wide awake the moment their head hits the pillow.
How poor sleep makes anxiety worse the next day
The loop runs in the other direction too. A short or broken night leaves the emotional part of the brain more reactive and the calming, rational part less able to keep it in check. After bad sleep, small problems feel bigger, setbacks feel more threatening, and your capacity to reassure yourself shrinks.
So you wake already depleted, more prone to worry, more likely to catastrophise about how the day — and the coming night — will go. That daytime anxiety then follows you back to bed. Each turn of the wheel makes the next one more likely, which is exactly why insomnia so rarely fixes itself once anxiety is involved. If you’d like a fuller picture of how these patterns take hold, our complete guide to insomnia walks through the mechanics in more detail.
Why willpower and worry management often aren’t enough
Most people try to solve this on their own first, and the usual attempts make sense on the surface — but they tend to backfire:
- Trying harder to sleep. Sleep is one of the few things that gets further away the more effort you put in. Straining to fall asleep raises arousal, the opposite of what you need.
- Going to bed earlier. Spending longer in bed to “catch up” usually means more time lying awake and anxious, strengthening the bed-equals-wakefulness link.
- Relying on sleeping pills. Medication can help in the very short term, but it doesn’t retrain the sleep system or address the anxiety, and the effect often fades. Coming off it can bring its own worry.
- Managing the anxiety alone. General relaxation helps some people, but if the sleep system itself has become conditioned to wakefulness, calming your mind isn’t enough on its own.
None of this means you’ve failed. It means the standard advice — and the sleep hygiene tips handed out by many GPs — simply doesn’t reach the mechanism that keeps the loop spinning.
How CBT-I breaks the cycle
Cognitive Behavioural Therapy for Insomnia (CBT-I) is the first-line, evidence-based treatment for chronic insomnia, recommended ahead of sleeping pills by clinical guidelines including those used across the NHS. What makes it so well suited to anxiety-driven insomnia is that it works on both halves of the loop at once. You can read more about why CBT-I works, but in brief it does four things:
- Rebuilds the bed–sleep connection. Structured stimulus-control and scheduling techniques retrain your brain to associate the bed with sleep again, rather than with lying awake worrying.
- Strengthens your sleep drive. By matching time in bed to your actual sleep need, CBT-I makes sleep come faster and deeper — which reduces the anxious clock-watching.
- Targets the anxious thoughts. The cognitive side tackles the catastrophic beliefs — “I’ll never cope tomorrow,” “I must get eight hours” — that keep the nervous system on high alert.
- Lowers night-time arousal. Specific techniques help settle the racing mind and physical tension that anxiety brings to bedtime.
Critically, the benefits reach beyond sleep. Meta-analyses of CBT-I — including remote and digital versions — show it not only improves insomnia but significantly reduces comorbid anxiety and depression, with improvements holding at six-month follow-up. In other words, treating the sleep loop tends to quieten the daytime worry as well. That is a very different outcome from simply masking symptoms with a tablet, and it’s the reason CBT-I forms the backbone of our online insomnia treatment.
What to expect from treatment
CBT-I is a short, structured, time-limited programme — typically a handful of weekly sessions rather than open-ended therapy. You’ll usually keep a brief sleep diary so we can tailor the approach to your actual pattern, and you’ll learn skills you keep for life. Most people notice meaningful change within a few weeks.
If your nights are dominated by waking and worrying in the small hours, you may also find it helpful to read about why you wake up in the middle of the night, which is one of the ways anxiety most often disrupts sleep.
Frequently asked questions
Does treating insomnia also help anxiety?
Often, yes. Research shows that CBT-I improves not only sleep but also comorbid anxiety and depression, with benefits maintained at six-month follow-up. Improving sleep appears to be part of the reason anxiety eases, because better-rested brains regulate emotion more effectively.
Which comes first, the insomnia or the anxiety?
It varies, and it usually doesn’t matter for treatment. Insomnia and anxiety have a bidirectional relationship — each one can trigger and worsen the other — so once they are locked together, the most effective approach is to treat the loop itself rather than trying to decide which came first.
Can CBT-I work if my anxiety feels constant, not just at night?
Yes. CBT-I targets the night-time arousal and unhelpful sleep beliefs that keep insomnia going, and improved sleep in turn reduces daytime reactivity. Many people find their general anxiety becomes more manageable as their nights stabilise. If a separate anxiety disorder needs its own treatment, CBT-I works well alongside it.
Do I have to stop my sleeping tablets to start CBT-I?
No. You can begin CBT-I while still taking medication. Never stop or change a prescribed medication on your own — always do so with your GP. CBT-I is often the very thing that makes coming off sleeping pills possible later, by giving your sleep system a way to work without them.
You can step off the wheel
If insomnia and anxiety have been feeding each other for months, please know that this is a recognised, treatable pattern — not a personal failing, and not something you simply have to endure. Breaking the loop is exactly what CBT-I is designed to do, addressing the sleeplessness and the worry together rather than one at a time.
A good first step is our free insomnia self-assessment, which takes a few minutes and helps clarify what’s keeping you awake. If you’d like to talk it through, you’re welcome to get in touch — restful nights, and calmer days, are genuinely within reach.