CBT-I: Cognitive Behavioural Therapy for Insomnia

What is CBT-I?

Insomnia is best understood as “difficulty sleeping, driven by the fear of not being able to sleep”. Someone with insomnia develops worries about their sleep, and in response adopts a range of behaviours to try to cope. Instead of sleep being a natural process that requires no effort, planning or hard work, the person tries to “force” sleep — and the harder they try, the worse it gets.

The aim of cognitive behavioural therapy for insomnia is to identify the unhelpful beliefs about sleep and the behaviours a person uses to cope, examine them, and replace them with a different approach — one that reduces sleep difficulty significantly and leads to better-quality sleep.

What counts as insomnia?

Insomnia is not one or two bad nights, which most of us experience from time to time (usually during stressful periods). Chronic insomnia is difficulty that persists — trouble falling asleep, trouble staying asleep, or waking unrefreshed — occurring at least three nights a week for three months or more, despite adequate opportunity to sleep. It causes significant distress or impairs daytime functioning (at work, emotionally, socially), and is not better explained by another sleep disorder (such as sleep apnoea), a mental-health condition (such as depression) or a physical illness (such as asthma).

Insomnia is one of the most common health complaints, affecting roughly 9% of people. People with insomnia tend to over-estimate how long it takes them to fall asleep and under-estimate how long they actually sleep, and they fear the consequences of “bad” sleep. During the day they may report reduced ability to carry out daily activities, sleepiness, fatigue, difficulty concentrating and memory problems. Insomnia also frequently occurs alongside depression, anxiety and substance use — and the evidence shows it is a genuine risk factor that can contribute to the development of these other conditions, not merely a symptom of them.

How does normal sleep work?

Good sleep supports a wide range of healthy functions: memory consolidation, learning, cognitive performance, emotional regulation, physical restoration and a strong immune system. Chronic disruption to sleep can impair all of these.

The stages of sleep

Sleep cycles through several stages during the night:

• NREM sleep, in three stages — N1 (the transition from wake to sleep, when you may not even realise you slept), N2 (light sleep), and N3 (deep sleep, the hardest to wake from — it is completely normal to feel groggy when woken from it).
• REM sleep — when we dream; the final part of each cycle.

A full cycle lasts about 90 minutes, and there are several cycles each night. Most deep sleep happens early in the night, with more REM later on. It is normal to wake briefly after a cycle and fall back to sleep easily.

The two systems that drive sleep

Two systems regulate the sleep–wake cycle. The first is sleep pressure (the homeostatic process), which works like hunger and thirst: the longer you have been awake, and the less you slept the night before, the stronger your drive to sleep. The second is the body clock (the circadian process), the roughly 24-hour rhythm that sets when you are naturally sleepy and when you are alert — independent of how much you slept the night before. In insomnia, we often behave in ways that undermine both of these systems.

Why doesn’t insomnia just go away?

To cope with poor sleep, people try many things that don’t help: meditation, relaxation, medication with and without prescription, alcohol, rigid sleep rules, changing the bedroom, avoiding certain foods. The processes that maintain insomnia are: worry, monitoring for “threats”, and safety behaviours (actions that feel reassuring in the short term).

People with insomnia spend a long time lying in bed, trying hard to fall asleep and worrying that they aren’t. This worry produces distress and physical arousal, which makes sleep even harder. In this anxious state they selectively monitor internal sensations (heart rate, warmth, tension) and the external environment (the bedroom clock), and interpret them as sleep-related “threats”. Checking the clock repeatedly only increases the pressure, because they watch time pass while still awake.

Crucially, if you believe you haven’t slept enough — even when objectively you have — that belief is itself a fresh source of worry, both at night and the next day.

The core thinking patterns in insomnia

• Unhelpful beliefs about sleep and tiredness — about how much sleep is needed (“I must get eight hours most nights”), fear of consequences (“after a bad night I definitely won’t cope at work”), and loss of control (“when I can’t sleep I must stay in bed and try harder”, “I have to actively control my sleep”).
• Worry — especially about the health and functional consequences of poor sleep, and about losing the ability to sleep at all.
• Monitoring for “threats” to sleep — scanning the body and environment for signs of wakefulness, watching the clock, and during the day looking for signs of tiredness.
• Misperceiving sleep and daytime functioning — judging sleep quality by how you feel on waking, when those feelings are influenced by many things. (For 5–20 minutes after waking there is a normal grogginess called sleep inertia.) People also tend to over-estimate how badly a poor night affects their day.
• Safety behaviours — napping, lying in, going to bed early, cancelling plans, “taking it easy”. These flow from beliefs about sleep and, unfortunately, maintain those beliefs rather than disproving them. A daytime nap, for example, makes it harder to fall asleep that evening — reinforcing the belief that “I can’t sleep”.

The CBT-I techniques — practical tools

Please note: the material below is educational and does not replace a proper assessment and treatment with a qualified professional. Always consult a relevant professional.

1. Stimulus control — relearning that “bed means sleep”

Stimulus control is based on a simple principle: a specific cue can reliably trigger a predictable response. For people with insomnia, the bed has become a cue for frustration, fear and wakefulness, rather than for sleepiness and calm. The therapeutic aim is to rebuild a positive association between the bed and the ability to relax and sleep. The rules:

1. Reduce time spent in bed awake — use the bed only for sleep (and intimacy). No worrying, working, reading, watching TV or planning in bed.
2. Get up at the same time every morning, regardless of when you went to bed or how “badly” you think you slept. This anchors your body clock, exposes you to morning light, and preserves sleep pressure for the following night.
3. If you don’t fall asleep within about 15 minutes (or wake and can’t get back to sleep), get out of bed, go to another room and do something quiet until you feel sleepy, then return to bed. Repeat if needed.
4. Only go to bed when you feel sleepy — not merely tired. Sleepiness is the urge to sleep; tiredness is feeling worn out and wanting to rest.
5. Don’t “try” to sleep. Sleep cannot be forced — trying harder raises tension and pushes sleep further away.
6. Avoid all napping during the day.

2. Sleep restriction (scheduling)

Sleep restriction is a behavioural technique that can dramatically improve insomnia. By matching time in bed to the amount you actually sleep, it shortens the time to fall asleep and reduces night-time waking, raising sleep efficiency (time asleep ÷ time in bed × 100). The aim is to reach 85–90% efficiency or higher.

How it works: track your sleep with a sleep diary for about 10 days and calculate your average nightly sleep. Fix a constant wake time based on your daily life, then set your bedtime by counting back that average plus about 30 minutes. Keep to these times consistently. After a week, review: if there is little improvement, reduce the sleep window by a further 30 minutes; once efficiency is consistently good, gradually add time back in 15-minute steps. Do not restrict sleep below 5 hours, and if you have a relevant medical condition (for example epilepsy or bipolar disorder) check with your doctor first.

3. Relaxation

The stressful thoughts and frustration of lying awake create tension, which itself makes sleep harder. Progressive muscle relaxation (Jacobson’s technique) can reduce that tension. Work through each muscle group in turn — tensing for about 15 seconds while breathing in slowly, then fully releasing while breathing out — starting with the large muscles of the hands and arms and moving through the face, neck, chest, abdomen and legs. It takes time and practice; rehearse it at times other than when you are trying to sleep.

Important points to remember

1. The sleep mechanism is robust and always working — but the way we behave can disrupt it.
2. Expectations are often unrealistic. No one sleeps “perfectly”; everyone has poor nights for many reasons.
3. People differ in how much sleep they need and how well they tolerate having less.
4. The goal of treatment is to change the way we respond to sleep difficulty — because the usual responses tend to make it worse.
5. It is important to rule out sleep apnoea (signs include loud snoring or sleeping with an open mouth; higher risk with excess weight). If suspected, see your GP or an ENT specialist first.
6. If you wish to reduce sleeping medication as part of this process, do so only with your prescribing doctor’s guidance.

Finally: this approach can temporarily increase daytime sleepiness in the short term, which is expected. Take care to avoid activities that sleepiness could affect — such as long drives — while you adjust.