It's 2:47am. You know this because you've checked the clock four times in the last twenty minutes. You're lying in bed, exhausted, desperate to sleep, and wide awake. Your mind is racing — replaying the day, rehearsing tomorrow, calculating how many hours of sleep you'll get if you fall asleep right now. The calculation is never reassuring.

You try to force yourself to relax. You tell yourself to stop thinking. You flip the pillow to the cool side. You change position. Nothing works. The harder you try to sleep, the more awake you become. And underneath the frustration, there's a growing dread: if you don't sleep tonight, tomorrow will be unbearable. You'll be foggy, irritable, unable to function. You know this because it's happened before. Many times.

If this sounds familiar, you're not alone. Roughly one in three adults experiences insomnia symptoms, and for many, it becomes a chronic pattern — weeks, months, sometimes years of broken, insufficient, or non-restorative sleep. And while sleeping pills are the most commonly prescribed treatment, the gold standard according to research isn't medication at all. It's a form of CBT specifically designed for insomnia: **CBT-I**.

CBT-I — Cognitive Behavioural Therapy for Insomnia — is a structured, evidence-based treatment that addresses the thoughts and behaviours that perpetuate poor sleep. Unlike sleeping pills, which mask the symptoms without addressing the cause, CBT-I targets the underlying patterns that keep insomnia going.

The evidence for CBT-I is remarkably strong. Multiple meta-analyses have shown it to be as effective as medication in the short term and significantly more effective in the long term. The National Institute for Health and Care Excellence (NICE) and the American College of Physicians both recommend CBT-I as the first-line treatment for chronic insomnia — before medication.

CBT-I works because insomnia, once it becomes chronic, is maintained by a predictable set of cognitive and behavioural patterns. The original trigger — stress, illness, a life change, a new baby — may have long since passed. But the habits and thought patterns that developed in response to the sleep disruption have taken on a life of their own. CBT-I dismantles these patterns, one by one.

Sleep researchers use the **3P Model** to explain how insomnia develops and persists:

Predisposing Factors

Some people are more vulnerable to insomnia than others. Genetic factors, temperament (particularly anxiety-proneness), and a tendency toward hyperarousal all increase the baseline risk. These factors don't cause insomnia on their own, but they lower the threshold — like dry kindling waiting for a spark.

Precipitating Factors

Something disrupts your sleep. A stressful period at work. A bereavement. A new baby. An illness. A change in routine. This is the trigger — the event that pushes you over the threshold from sleeping normally to sleeping badly. For most people, once the trigger resolves, sleep returns to normal. But for some, it doesn't.

Perpetuating Factors

This is where insomnia becomes chronic — and this is exactly what CBT-I targets. The perpetuating factors are the thoughts and behaviours you adopt in response to poor sleep that, ironically, keep the poor sleep going.

You start going to bed earlier to "catch up" on sleep. You lie in bed for hours, tossing and turning. You start napping during the day. You cancel evening plans because you're too tired. You drink more coffee to compensate. You check the clock repeatedly during the night. You catastrophise about the consequences of not sleeping. You associate your bed with frustration and wakefulness rather than rest.

Each of these responses makes intuitive sense — they're all attempts to solve the sleep problem. But each one actually maintains it. Understanding why requires understanding the two systems that govern sleep.

Sleep Drive (Process S)

Sleep drive works like hunger. The longer you've been awake, the stronger the drive to sleep becomes. It builds throughout the day — a chemical called adenosine accumulates in your brain, creating increasing pressure to sleep. When sleep drive is high, falling asleep is relatively easy.

Here's the problem: many of the "common sense" responses to insomnia undermine sleep drive. Sleeping in late reduces it. Napping during the day reduces it. Going to bed too early means you haven't built enough of it. The result is that you arrive at bedtime without enough sleep pressure to fall asleep easily — which triggers more anxiety, which makes sleep even harder.

Circadian Rhythm (Process C)

Your circadian rhythm is your body's internal clock — a roughly 24-hour cycle that regulates when you feel alert and when you feel sleepy. It's influenced by light exposure, meal timing, activity patterns, and routine. When your circadian rhythm is well-calibrated, it works with your sleep drive to produce consistent, predictable sleep.

Irregular sleep schedules — going to bed and waking up at different times — disrupt this rhythm. Your body doesn't know when it's supposed to be sleeping and when it's supposed to be awake. The clock loses its calibration, and sleep becomes unpredictable.

CBT-I works by optimising both systems: building sleep drive and stabilising the circadian rhythm, while addressing the thoughts and associations that generate the hyperarousal keeping you awake.

CBT-I typically runs for four to eight sessions, though many people see significant improvement within two to three weeks. The first week is often the hardest — sleep restriction in particular can leave you feeling more tired before you feel better. This is normal and expected.

The improvement isn't usually gradual and linear. You might have a good night followed by a bad one, then two good nights, then a mediocre one. The overall trajectory is upward, but the path is uneven. Trust the process and focus on the weekly trends, not individual nights.

Most people who complete CBT-I see lasting improvements — unlike medication, where sleep often deteriorates again once the drug is stopped. CBT-I teaches skills that remain with you permanently, so even if insomnia returns during a stressful period, you have the tools to address it quickly.

Perhaps the deepest lesson of CBT-I is this: you cannot force yourself to sleep. Sleep is not something you do — it's something that happens when the conditions are right. The harder you try to sleep, the more aroused you become, and the further sleep recedes.

The paradox is that letting go of the struggle — accepting wakefulness when it comes, getting out of bed when sleep won't arrive, reducing the pressure and the catastrophising — is what allows sleep to return. You don't chase it. You create the conditions for it, and then you wait. And more often than not, it comes.