Module 24

Sleep Deprivation and Sleep Disorders

  • Effects of Sleep Loss:

    • Sleep deprivation leads to fatigue, irritability, impaired concentration, productivity, and memory.

    • Associated with increased risk of depression, obesity, joint pain, immune system suppression, and accidents.

  • Current Sleep Trends: 40% of Americans sleep 6 hours or less; many students report feeling tired or lacking energy.

  • Sleep Debt: Affects emotional well-being; accumulates after a few nights of restricted sleep.

    • Studies show resuming normal sleep can relieve sleep debt and enhance mood.

  • Physical Health Impact:

    • Sleep deprivation increases ghrelin and decreases leptin, promoting weight gain.

    • Suppresses immune function; people sleeping <5 hours are more likely to develop colds.

  • Major Sleep Disorders:

    • Insomnia: Difficulty falling/staying asleep; prevalent in adults, especially older adults.

    • Narcolepsy: Sudden sleep attacks, often triggered by strong emotions; can result in loss of muscular control (cataplexy).

    • Sleep Apnea: Intermittent cessation of breathing during sleep; linked to obesity, often unnoticed by sufferers.

    • Night Terrors: High arousal and terror during childhood NREM-3 sleep, little recall.

    • Sleepwalking: Common in children, usually harmless, occurs in NREM-3 sleep.

Dreams

  • Nature of Dreams: 80% of dreams contain negative emotions; often related to stress or anxiety.

  • Content of Dreams: Primarily everyday experiences, less than 10% of dreams include sexual content.

  • Functions of Dreams:

    • Freud's Theory: Dreams serve as a safety valve for repressed desires (manifest content vs. latent content).

    • Information-Processing: Aid in memory consolidation, processing daily experiences.

    • Physiological Function: Promote brain development and health during REM sleep.

    • Activation-Synthesis: Dreams result from the brain's attempt to make sense of neural activity.

    • Cognitive Development: Reflect cognitive maturity; dreams simulate real-life scenarios and emotions.

  • Importance of REM Sleep: REM rebound occurs after sleep deprivation; essential for emotional well-being and memory consolidation.