# Insomnia: CBT-I as First-Line Treatment

## Introduction

Chronic insomnia disorder affects approximately 10% of the adult population and is associated with significant impairment in daytime functioning, increased risk of depression, anxiety, cardiovascular disease, and reduced quality of life. **Cognitive behavioral therapy for insomnia (CBT-I)** is recommended as the first-line treatment by the American College of Physicians, the American Academy of Sleep Medicine, and the European Sleep Research Society, based on robust evidence demonstrating efficacy equal to or exceeding pharmacotherapy with superior long-term outcomes.

## Defining Insomnia

### DSM-5 Criteria for Insomnia Disorder

Difficulty initiating or maintaining sleep, or early morning awakening, at least **3 nights per week for 3 or more months**. Adequate opportunity and circumstances for sleep. Clinically significant distress or functional impairment. Not better explained by another sleep disorder, medical condition, substance, or medication.

### Subtypes

**Sleep-onset insomnia**: difficulty falling asleep (> 30 minutes) **Sleep-maintenance insomnia**: frequent or prolonged awakenings during the night. **Early morning awakening**: waking before desired time with inability to return to sleep. Many patients exhibit a combination.

## The 3P Model of Insomnia

Spielman's **3P model** provides the conceptual framework for CBT-I:
**Predisposing factors**: genetic vulnerability, anxious temperament, hyperarousability. **Precipitating factors**: stressful life events, medical illness, schedule changes, pain. **Perpetuating factors**: maladaptive behaviors and cognitions that maintain insomnia after the precipitating event resolves (e.g., spending excessive time in bed, napping, sleep-related worry)

CBT-I specifically targets the **perpetuating factors**.
![Spielman's 3P model illustrating the development and maintenance of chronic insomnia](images/3p-model-insomnia.png)

## Components of CBT-I

### Sleep Restriction Therapy

The most potent behavioral component of CBT-I. **Limit time in bed** to match actual sleep time (determined by sleep diary), with a minimum of 5 hours. Creates mild sleep deprivation, which increases homeostatic sleep drive and consolidates sleep. Gradually increase time in bed by 15-30 minutes when sleep efficiency exceeds 85%. **Sleep efficiency** = (total sleep time / time in bed) x 100.

### Stimulus Control

Developed by Richard Bootzin; strengthens the association between the bed and sleep. Rules: go to bed only when sleepy; use the bed only for sleep and sex; if unable to sleep within approximately 20 minutes, get up and do a quiet activity; return to bed only when sleepy; maintain a fixed wake time regardless of sleep; avoid napping. Addresses conditioned arousal associated with the bed environment.

### Cognitive Therapy

Identify and challenge **dysfunctional beliefs about sleep**. Common maladaptive cognitions: "I must get 8 hours or I can't function," "Insomnia will cause serious health problems," "I have no control over my sleep". Replace with realistic appraisals: "I can function adequately on less than perfect sleep," "One bad night does not create a crisis". Reduce performance anxiety about sleep.

### Sleep Hygiene Education

Supportive but **insufficient as a standalone treatment**. Components: consistent sleep-wake schedule, comfortable sleep environment (cool, dark, quiet), limit caffeine (especially after noon), limit alcohol (disrupts sleep architecture), regular exercise (but not close to bedtime), avoid screens 1 hour before bed. Best used as an adjunct to behavioral and cognitive components.

### Relaxation Training

Progressive muscle relaxation, diaphragmatic breathing, guided imagery. Addresses physiological hyperarousal. Most helpful for patients with prominent somatic tension.

## Evidence for CBT-I

### Efficacy

Multiple meta-analyses demonstrate large effect sizes for sleep onset latency, wake after sleep onset, and sleep efficiency. Comparable to pharmacotherapy in the short term; **superior in the long term**. Effects are maintained at 6-month and 12-month follow-up. Effective across age groups, including older adults.

### Comorbid Conditions

CBT-I is effective for insomnia comorbid with depression, anxiety, chronic pain, PTSD, and substance use disorders. Treating insomnia with CBT-I often improves the comorbid psychiatric condition. The TRIAD study showed CBT-I reduced depression severity independent of antidepressant effects.

### Delivery Formats

**Individual therapy**: gold standard, typically 4-8 sessions. **Group therapy**: effective and cost-efficient. **Digital CBT-I (dCBT-I)**: web-based and app-based platforms (e.g., Somryst/Pear Therapeutics, Sleepio) have demonstrated efficacy in RCTs. **Stepped care**: digital CBT-I as a first step, with therapist-delivered CBT-I for non-responders.

![Evidence pyramid for CBT-I efficacy across delivery formats and populations](images/cbti-evidence-pyramid.png)

## CBT-I vs. Pharmacotherapy

| Feature | CBT-I | Pharmacotherapy |
|---|---|---|
| Short-term efficacy | Comparable | Comparable |
| Long-term efficacy | Sustained | Effects diminish after discontinuation |
| Side effects | Transient sleep restriction effects | Sedation, cognitive impairment, dependence, falls |
| Relapse rate | Low | High after discontinuation |
| Patient preference | Often preferred when explained | Often requested due to convenience |

## Barriers and Solutions

**Workforce shortage**: insufficient trained CBT-I providers; digital CBT-I can expand access. **Patient adherence**: sleep restriction can be uncomfortable initially; education about the rationale improves compliance. **Clinician awareness**: many providers default to pharmacotherapy due to unfamiliarity with CBT-I. **Comorbid disorders**: some clinicians worry about addressing insomnia separately; evidence supports concurrent treatment.

![Barriers to CBT-I implementation and strategies to overcome them](images/cbti-barriers-solutions.png)

## Key Clinical Pearls

CBT-I is the first-line treatment for chronic insomnia in all age groups; pharmacotherapy should be second-line. Sleep restriction therapy is the most effective single component but requires careful implementation and monitoring. Sleep hygiene alone is not an adequate treatment for chronic insomnia. Digital CBT-I is an evidence-based option that can address access barriers. Treating insomnia often improves comorbid depression and anxiety, suggesting insomnia may be a transdiagnostic treatment target.

## References

1. Qaseem A, Kansagara D, Forciea MA, et al. Management of chronic insomnia disorder in adults: a clinical practice guideline from the American College of Physicians. *Ann Intern Med*. 2016;165(2):125-133.
2. Trauer JM, Qian MY, Doyle JS, et al. Cognitive behavioral therapy for chronic insomnia: a systematic review and meta-analysis. *Ann Intern Med*. 2015;163(3):191-204.
3. Morin CM, Vallières A, Guay B, et al. Cognitive behavioral therapy, singly and combined with medication, for persistent insomnia: a randomized controlled trial. *JAMA*. 2009;301(19):2005-2015.
4. Espie CA, Emsley R, Kyle SD, et al. Effect of digital cognitive behavioral therapy for insomnia on health, psychological well-being, and sleep-related quality of life: a randomized clinical trial. *JAMA Psychiatry*. 2019;76(1):21-30.