Insomnia disorder

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Insomnia Disorder - The Wide-Awake Club

  • Difficulty initiating or maintaining sleep, or nonrestorative sleep, leading to daytime impairment.
  • Diagnostic criteria: Symptoms ≥3 nights/week for ≥3 months, despite adequate opportunity for sleep.
  • Management focuses on identifying and treating underlying causes.

Good Sleep Habits: Day and Night

⭐ Cognitive Behavioral Therapy for Insomnia (CBT-I) is the first-line treatment and is more effective long-term than medication.

Pathophysiology - The 3P Hyperarousal Model

  • Core Concept: Insomnia results from a state of hyperarousal, where predisposing traits are triggered by a precipitating event, and the resulting sleep disturbance is maintained by perpetuating factors.

  • The 3 Ps:

    • Predisposing: Baseline vulnerability (e.g., genetics, anxiety traits).
    • Precipitating: Acute triggers (e.g., life stressor, illness).
    • Perpetuating: Factors that maintain insomnia (e.g., poor sleep hygiene, catastrophic thoughts about sleep).

First-line treatment, Cognitive Behavioral Therapy for Insomnia (CBT-I), directly targets the perpetuating factors (maladaptive behaviors and cognitive distortions) that maintain chronic insomnia.

3P Model of Insomnia and Psychopathology

Diagnosis & Workup - The Sleep Detective

  • Clinical Interview is Primary: Detailed history of sleep patterns (bedtime, latency, awakenings), daytime dysfunction, and psychiatric/medical history.
  • Sleep Diary/Log: Patient tracks sleep for 1-2 weeks to identify patterns. The cornerstone of behavioral assessment.
  • Actigraphy: Wrist-worn device provides objective data on sleep-wake cycles; useful when subjective reports are unclear.
  • Polysomnography (PSG): Not routinely indicated. Reserved for suspected comorbid sleep disorders (e.g., sleep apnea, periodic limb movement disorder).

Exam Favorite: Insomnia is a major risk factor for and is frequently comorbid with Major Depressive Disorder (MDD). Always screen for mood symptoms.

📌 Mnemonic "3-3-3": Difficulty initiating/maintaining sleep for ≥3 nights/week for ≥3 months, causing significant distress/impairment.

Sample Sleep Diary for Insomnia Diagnosis

Management - CBT-I Before Pills

  • First-Line Therapy: CBT-I is the preferred initial treatment for chronic insomnia, recommended over pharmacotherapy due to its durable effects and lack of medication-related side effects.

  • Core Components:

    • Stimulus Control: Re-associate the bedroom with sleep. If not asleep in 20 min, leave the room. Use bed only for sleep/intimacy.
    • Sleep Restriction: Limit time in bed to the actual time spent sleeping to improve sleep efficiency.
    • Cognitive Therapy: Challenge dysfunctional beliefs about sleep (e.g., "I need 8 hours to function").
    • Relaxation Training: Diaphragmatic breathing, progressive muscle relaxation.
    • Sleep Hygiene: Foundational but insufficient alone.

Exam Favorite: The therapeutic effects of CBT-I are more sustained over time compared to sedative-hypnotic medications, which often have waning efficacy and risk of dependence.

CBT-I Components for Insomnia Treatment

High‑Yield Points - ⚡ Biggest Takeaways

  • Insomnia disorder is defined by difficulty initiating or maintaining sleep, occurring at least 3 nights per week for ≥3 months, causing significant functional impairment.
  • Cognitive Behavioral Therapy for Insomnia (CBT-I) is the undisputed first-line treatment and is more effective long-term than pharmacotherapy.
  • If medication is needed, use short-term; non-benzodiazepines (e.g., zolpidem, eszopiclone) are preferred over benzodiazepines.
  • Always rule out comorbid medical or psychiatric conditions, substance use, and poor sleep hygiene.
  • Associated with increased risk of depression, anxiety, and accidents.

Practice Questions: Insomnia disorder

Test your understanding with these related questions

An otherwise healthy 55-year-old woman comes to the physician because of a 7-month history of insomnia. She has difficulty initiating sleep, and her sleep onset latency is normally about 1 hour. She takes melatonin most nights. The physician gives the following recommendations: leave the bedroom when unable to fall asleep within 20 minutes to read or listen to music; return only when sleepy; avoid daytime napping. These recommendations are best classified as which of the following?

1 of 5

Flashcards: Insomnia disorder

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Which stage of sleep does bedwetting occur? _____

TAP TO REVEAL ANSWER

Which stage of sleep does bedwetting occur? _____

Stage N3

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