Sleep in Psychiatric Disorders

Sleep & Psyche - Entangled Realities

• Strong bidirectional link: sleep problems ↔ psychiatric disorders.
• High comorbidity: Insomnia common in depression, anxiety; REM sleep changes in depression.
• Sleep disruption can precede, co-occur, or follow psychiatric illness.
• Impacts: Worsens symptoms, impairs treatment response, ↓ quality of life.
• Crucial: Assess sleep in all psychiatric evaluations.
• Treatment often needs to address both sleep & mental health.

⭐ The relationship between sleep and psychiatric disorders is often bidirectional, meaning poor sleep can worsen psychiatric symptoms, and psychiatric conditions can disrupt sleep.

Depression's Sleep - The Gloom Snooze

• Common Sleep Disturbances:
  • Difficulty Initiating Sleep (DIS) & Difficulty Maintaining Sleep (DMS).
  • Early Morning Awakening (EMA): Often a hallmark symptom.
  • Subjective non-restorative sleep, feeling tired upon waking.
  • Hypersomnia: Less common, may occur in atypical depression.
• Polysomnography (PSG) Findings:
  • ↓ REM latency: Time to first REM period is shorter. (📌 DEcreased REM latency in DEpression).
  • ↑ REM density: More rapid eye movements during REM sleep.
  • ↑ Wakefulness After Sleep Onset (WASO).
  • ↓ Slow-Wave Sleep (SWS/N3 sleep): Less deep, restorative sleep.
  • ↓ Total sleep time & ↓ sleep efficiency.
  • Increased sleep fragmentation.

⭐ Shortened REM latency and increased REM density are hallmark polysomnographic findings in Major Depressive Disorder.

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Bipolar & Anxiety - Unsettled Slumbers

Bipolar Disorder: Sleep varies by phase.

Anxiety Disorders:

• Generalized Anxiety Disorder (GAD):
  • Difficulty Initiating & Maintaining Sleep (DIMS) due to worry.
  • Restless, non-restorative sleep.
• Panic Disorder:
  • Nocturnal panic attacks.
  • Learned sleep avoidance.
• Post-Traumatic Stress Disorder (PTSD):
  • Severe insomnia, frequent awakenings.
  • Distressing nightmares.

Schizophrenia's Sleep - Fragmented Nights

• Marked by severe sleep fragmentation and ↓ sleep quality.
• Common Polysomnography (PSG) changes:
  • ↓ Sleep efficiency
  • ↑ Sleep Onset Latency (SOL)
  • ↑ Wake After Sleep Onset (WASO)
  • ↓ Total Sleep Time (TST)
  • ↓ REM latency (often)
  • Variable REM density & duration
• Circadian rhythm dysregulation frequent.
• Antipsychotics: variable impact; some improve continuity, others cause sedation/Restless Legs Syndrome (RLS).

  ⭐ Significant reduction in Slow-Wave Sleep (SWS) is a consistent finding in schizophrenia and is often correlated with negative symptoms. oka

High‑Yield Points - ⚡ Biggest Takeaways

• Depression: Characterized by ↓ REM latency, ↑ REM density, and ↑ total REM sleep.
• Insomnia is a core symptom in depression and anxiety disorders.
• Mania (Bipolar Disorder): Marked by ↓ sleep need and ↓ total sleep time.
• PTSD: Often presents with recurrent nightmares and sleep fragmentation.
• Antidepressants (SSRIs, TCAs) typically suppress REM sleep; some may cause insomnia.
• Schizophrenia: Associated with ↓ sleep efficiency, ↓ slow-wave sleep, and sleep spindle deficits.