Sleep Disorders in Psychiatric Conditions

Intro: Sleep & Psyche - Tangled Twins

• Sleep & psychiatric health: a critical bidirectional relationship. Disruption in one often initiates or exacerbates the other, impacting overall well-being.
• Key Neurotransmitters involved:
  • Serotonin: Regulates mood, anxiety, sleep onset.
  • Norepinephrine: Affects arousal, stress response, REM sleep.
  • Dopamine: Influences motivation, wakefulness, reward systems.
  • GABA: Primary inhibitory neurotransmitter, promotes sleep.
  • Melatonin: Governs circadian rhythm, sleep-wake cycle.
  • Orexin (Hypocretin): Promotes and maintains wakefulness.
• Impact: Sleep quality significantly influences psychiatric illness course, symptom severity, and treatment efficacy.

⭐ Chronic sleep deprivation can mimic or exacerbate a wide range of psychiatric symptoms, often complicating diagnosis and treatment outcomes.

Mood Disorders: Sleep - Ups & Downs

• Depression:

  • Insomnia (middle/late, early morning awakening) common.
  • Hypersomnia less common.
  • PSG findings:
    • REM: ↓ latency, ↑ density & duration. 📌 'REM is Ready Early & More'.
    • Sleep: ↑ awakenings, ↓ efficiency.
    • ↓ Slow Wave Sleep (SWS/N3).

  ⭐ Shortened REM latency is a biological marker associated with depression.

• Bipolar Disorder:

  • Mania/Hypomania:
    • ↓ need for sleep (e.g., rested after 3 hrs).
    • ↓ total sleep time.
    • Difficulty initiating/maintaining.
  • Bipolar Depression:
    • Insomnia/hypersomnia (like unipolar).
    • PSG mirrors unipolar depression.

Anxiety & PTSD: Sleep - Fearful Nights

• Generalized Anxiety Disorder (GAD):
  • Sleep onset and/or maintenance insomnia.
  • Excessive worry at bedtime disrupts sleep.
• Panic Disorder:
  • Nocturnal panic attacks: abrupt awakenings with intense fear.
• Post-Traumatic Stress Disorder (PTSD):
  • Insomnia: difficulty falling/staying asleep.
  • Frequent, distressing nightmares (trauma-related).
  • Physiological hyperarousal prevents sleep.
  • Prazosin often used for PTSD nightmares.

  ⭐ Nightmares in PTSD are a core diagnostic feature and a primary target for pharmacological interventions like Prazosin.

• Obsessive-Compulsive Disorder (OCD):
  • Delayed sleep phase syndrome common.
  • Difficulty initiating sleep due to pre-sleep rituals or intrusive thoughts.

Schizophrenia: Sleep - Reality Rifts

• Marked sleep disruption is a core feature, often predating psychosis.
• Circadian rhythm abnormalities are prevalent, leading to irregular sleep-wake cycles.
• Polysomnography often reveals:
  • ↓ Slow Wave Sleep (SWS) - a hallmark finding.
  • ↓ Sleep efficiency.
  • Prolonged sleep latency.
  • ↑ awakenings and arousals.
• Antipsychotics: Variable effects; some (e.g., olanzapine, quetiapine) may improve sleep architecture, while others might not.

⭐ Significant reduction in Slow Wave Sleep (SWS) is commonly observed in schizophrenia.

Management: Sleep Rx - Assess & Address

• Assessment: Detailed sleep history, diaries. Actigraphy or Polysomnography (PSG) for specific indications (e.g., OSA, PLMD, diagnostic uncertainty).
• Management Strategy:
  • Always address the primary psychiatric condition.
  • Non-Pharmacological (First-line): Emphasize sleep hygiene; CBT-I is key for chronic insomnia.

  ⭐ CBT-I is the recommended first-line treatment for chronic insomnia in adults, including those with comorbid psychiatric conditions.

  • Pharmacotherapy: Use judiciously. Consider primary illness, drug interactions, and psychotropics' sleep side effects (e.g., some SSRIs ↑insomnia; TCAs/mirtazapine sedating).

High‑Yield Points - ⚡ Biggest Takeaways

• Depression: frequently presents with insomnia (esp. early morning awakening) or hypersomnia.
• REM sleep changes (↓ latency, ↑ REM density) are characteristic findings in depression.
• Mania/Bipolar: marked by a significantly decreased need for sleep.
• Anxiety Disorders (GAD, PTSD): frequently cause insomnia and nightmares.
• Schizophrenia: associated with disrupted sleep-wake cycles and reduced total sleep.
• Psychotropic Medications: many (SSRIs, antipsychotics) can impact sleep; consider as a cause.
• Sleep hygiene: crucial non-pharmacological intervention across psychiatric disorders.