CBT-I and sleep hygiene: what insomnia treatment involves

Why better bedtime habits may not be enough

Imagine someone who has made their bedroom quiet and dark but still spends hours awake there, calculating how little sleep remains before work. They compensate by going to bed earlier the following night, then lie awake for longer. The bedroom improvements have not addressed the association between bed and wakefulness, the extra time spent trying to sleep, or the growing anxiety about another bad night.

Those are examples of the patterns CBT-I targets. The American Academy of Sleep Medicine's 2021 guideline strongly recommends multicomponent CBT-I for adults with chronic insomnia. It conditionally recommends against using sleep hygiene alone as treatment. The second recommendation is weaker, and it does not mean that a comfortable bedroom or sensible caffeine habits are pointless.

A 2018 review by Chung and colleagues included 15 studies, 12 comparing sleep-hygiene education with CBT-I. People receiving hygiene advice reported some improvement, but CBT-I performed better. None of the studies compared hygiene education with sham treatment or no treatment, so improvement before and after advice could not establish its effect on its own.

A 2025 review of 42 trials also found that sleep-hygiene education was less effective than CBT-I for insomnia severity. The authors cautioned that most included studies had a high risk of bias. These findings support moving beyond repeated tips when insomnia persists; they do not promise that every CBT-I course will work equally well.

What you actually do during a CBT-I course

The US National Heart, Lung, and Blood Institute describes a typical course lasting six to eight weeks, delivered in person, by telephone or online. The AASM describes multicomponent treatment as commonly involving four to eight sessions, with sleep diaries used throughout. Course lengths vary, so these are examples of usual formats rather than a guaranteed timetable.

The first part is an assessment of the sleep problem and your circumstances. Between appointments, you practise the agreed techniques and record your sleep. Subsequent sessions review the pattern and adjust treatment.

A sleep diary gives the discussion something concrete to work with. "I had a terrible week" may describe the experience accurately, but a diary can distinguish taking a long time to fall asleep from repeated waking or waking earlier than intended. It also lets you describe what happens across several nights instead of relying on the single night that felt worst.

Rebuild the link between bed and sleep

Stimulus control aims to rebuild the link between bed and sleep. The Veterans Affairs patient guide explains the usual practices: go to bed when sleepy, use the bed for sleep and sex, leave it when unable to sleep, return when sleepy and keep a consistent waking time.

The point of getting up is to interrupt long periods of wakefulness and frustration in bed. A quiet activity elsewhere, such as reading something undemanding, can occupy you until sleepiness returns. Repeated clock checks can become another thing to worry about; treatment does not require timing each waking period with a stopwatch.

These instructions need to be workable in your home. If you share a room, have difficulty moving safely at night or provide overnight care, explain that before starting. A plan that assumes you can freely leave the bedroom is incomplete if you cannot. The treating professional can discuss an appropriate adaptation.

Adjust time in bed with professional guidance

Sleep restriction therapy initially brings time in bed closer to the sleep you are actually getting, estimated from a diary. It aims to increase the drive to sleep and make sleep more consolidated. As treatment progresses, the window is adjusted, including extending it when appropriate. The VA guide to limiting time in bed describes doing this with a trained healthcare professional and reviewing the schedule regularly.

Consider a fictional example: someone spends nine hours in bed but estimates that they sleep for six. A therapist would examine that three-hour gap alongside the diary, symptoms and daily responsibilities before agreeing a schedule. These numbers illustrate the problem; they are not a recommendation for a six-hour sleep window. The initial schedule, subsequent adjustments and safety limits depend on the person.

Daytime sleepiness can increase during treatment. The AASM flags circumstances in which sleep restriction may be unsuitable, including safety-critical work, a predisposition to mania or hypomania, poorly controlled seizures and excessive daytime sleepiness. These need attention before a schedule is set. A person who drives for work needs a plan that accounts for that responsibility.

The name can sound as though the aim is permanently to need less sleep. The treatment instead works on how sleep is organised and consolidated. You and the treating professional should know what would prompt an adjustment and how to get help if daytime functioning becomes unsafe.

Work on the worry around sleep

Cognitive work addresses thoughts and expectations that make sleep more threatening. Consider a fictional person thinking, "It is past midnight, so tomorrow is already ruined." The next steps might be repeated clock checking, cancelling plans and going to bed much earlier the following evening. A therapist can examine that sequence, question the certainty of the prediction and help the person try a different response.

Relaxation is another possible component. The AASM describes structured methods such as abdominal breathing, progressive muscle relaxation and guided imagery to reduce physical or mental arousal. These are usually taught as skills to practise. CBT-I can combine them with changes to sleep timing and stimulus control; a relaxation recording by itself does not contain the whole treatment.

How much difference did supported treatment make?

The HABIT trial's report describes 642 adults recruited in English primary care. Half received four nurse-delivered sleep-restriction sessions plus a sleep-hygiene leaflet; the comparison group received the leaflet alone. Two sessions were in person and two by telephone.

The researchers measured symptoms with the Insomnia Severity Index, a questionnaire scored from zero to 28. Higher scores mean worse symptoms. Its questions cover sleep difficulties, distress and interference with daily life.

At six months, the average score was 10.9 in the nurse-treatment group and 13.9 in the leaflet group. The adjusted difference was about three points in favour of the nurse-supported treatment.

What does that difference mean? On the scale's usual severity bands, scores of 8 to 14 are labelled subthreshold insomnia, 15 to 21 moderate and 22 to 28 severe. Both six-month group averages were within the 8-to-14 band, with the nurse-treatment average lower within it. The benefit was a lower symptom score on average; these averages do not tell you how many people recovered or how much any one person improved.

Participants and nurses knew which treatment was given. Also, 97% of participants were White and half had a university degree, which limits generalisation. HABIT tested supported sleep restriction, one component of CBT-I; its results do not establish how well every app or course works.

How to ask for help in the UK

The NHS advises seeing a GP if changing sleep habits has not helped, the problem has lasted for months, or it is making daily life difficult to cope with. A GP can investigate causes and may offer CBT face to face or through an online programme. Symptoms of another sleep disorder, such as sleep apnoea, may lead to a sleep-clinic referral. Do not drive when sleepy.

When discussing a course, establish whether it includes the treatment components described in this guide, how progress is reviewed and who helps if the plan is difficult to follow. A general wellbeing app, sleep sounds and a personalised CBT-I programme are different offers. A useful description should tell you what you will actually be doing between sessions.

Bring a short account of your nights and daytime difficulties, together with any constraints on your schedule. Shift work, caring responsibilities, pain and medication can change what is practical. Mention caffeine and alcohol used to get to sleep where relevant, without assuming either explains the whole problem.

Before starting, choose a few changes that would matter to you: less time awake in bed, less distress about sleep or an easier working day. Review these alongside the measures used by the service. If a sleep tracker's score dominates how you judge each morning, bring that up too.

Discuss sleeping tablets with the prescriber

A 2026 AASM guideline considers starting CBT-I and insomnia medication together. It conditionally suggests the combination over medication alone, but conditionally suggests against the combination over CBT-I alone. Both recommendations rely on low-certainty evidence.

Bring a list of what you take, including non-prescription sleep products, to the assessment. Any change to prescribed medication should be agreed with the prescriber. If different services are involved, make sure you know which one is responsible for medication reviews and which one adjusts the behavioural treatment.