CBT for insomnia: a guide to better sleep

What is insomnia?

Insomnia is one of the most common sleep disorders, affecting around one in three adults at some point in their lives. It is characterised by persistent difficulty falling asleep, staying asleep, or waking too early — despite having adequate opportunity for sleep — and resulting in daytime impairment such as fatigue, difficulty concentrating, or mood disturbance.

Insomnia can be short-term (acute), often triggered by stress or a significant life event, or long-term (chronic), defined as occurring at least three nights per week for three months or more. Chronic insomnia affects around 10% of adults and can have a significant impact on physical health, mental wellbeing, and quality of life.

What is CBT-I?

Cognitive Behavioural Therapy for Insomnia (CBT-I) is a structured, evidence-based treatment that addresses the thoughts, behaviours, and physiological patterns that perpetuate chronic insomnia. It is recommended as the first-line treatment for chronic insomnia by sleep medicine bodies in Australia and internationally, including the American Academy of Sleep Medicine.

Unlike sleep medication, which addresses symptoms in the short term, CBT-I targets the underlying mechanisms that maintain insomnia. Research consistently shows that CBT-I produces more durable improvements in sleep than medication, with benefits that are maintained — and often continue to improve — after treatment ends.

What does CBT-I involve?

CBT-I typically involves several interconnected components, tailored to the individual's specific sleep difficulties. Sleep restriction therapy involves temporarily limiting time in bed to consolidate sleep and rebuild the drive to sleep — this is often the most challenging but most effective component. Stimulus control aims to re-associate the bed and bedroom with sleepiness rather than wakefulness and worry.

Sleep hygiene education addresses habits and environmental factors that can interfere with sleep, such as caffeine, screen use, and irregular sleep schedules. Cognitive restructuring targets unhelpful beliefs and worries about sleep — for example, catastrophic thinking about the consequences of a poor night's sleep — which can themselves perpetuate insomnia.

Relaxation techniques, including progressive muscle relaxation and mindfulness-based approaches, can also be incorporated to reduce the physiological and cognitive arousal that often accompanies insomnia.

How is CBT-I different from sleep medication?

Sleep medications — including prescription hypnotics and over-the-counter aids — can be helpful for short-term sleep difficulties, but they do not address the underlying causes of chronic insomnia. Many people find that sleep medication becomes less effective over time, and some experience rebound insomnia when they stop taking it.

CBT-I, by contrast, works by changing the patterns of thinking and behaviour that maintain insomnia. While it requires more active engagement than taking a pill, the improvements it produces are typically more lasting. For many people, CBT-I also reduces or eliminates the need for sleep medication over time.

Who can benefit from CBT-I?

CBT-I is effective for most adults with chronic insomnia, including those with co-occurring conditions such as anxiety, depression, or chronic pain. It can be delivered individually with a psychologist, in group formats, or via digital programmes — though individual therapy allows for the most personalised approach.

If you have been struggling with sleep for more than a few weeks, or if poor sleep is affecting your daily functioning and wellbeing, it is worth speaking with your GP or a psychologist. A Mental Health Treatment Plan from your GP can provide access to Medicare-rebated psychology sessions, including CBT-I.