Exam Overview

  • Students have access to short answer essay questions.
  • Notes cannot be created for exams but can help organize thoughts.
  • Students can choose one essay for full credit and another for extra credit.
  • Instructor will automatically pick the strongest essay for full credit to maximize success.
  • Essays are weighted equally, and students should not choose harder questions just to impress.

Sleep and Its Importance

Reasons for Sleep

  • It is currently unclear why we sleep, but several theories exist:
    • Memory Processing: Some believe it allows the brain to process information and commit memories to long-term storage.
    • Regeneration: Another theory suggests that sleep is essential for physical regeneration.
    • Evolutionary Purpose: A belief that sleep evolved to keep organisms safe from predators at night.
  • Likely a combination of these reasons, with various influencing factors:
    • Biology
    • Age
    • Culture
    • Individual Variation
  • Sleep requirements vary:
    • Newborns: Approximately 16 hours.
    • Adults: About 8 hours or less.

Circadian Rhythm

  • Regulates sleep and is often hard to manually shift.
    • Example: Adjusting to jet lag involves using light and dark cues to help the body adjust to a new time zone.

Stages and Cycles of Sleep

Sleep Stages

  • Sleep Stages consist of distinct patterns of brain waves and muscle activity related to consciousness and sleep.
  • Four stages:
    • REM (Rapid Eye Movement) sleep, associated with dreaming.
    • Three non-REM stages (N1, N2, N3).
REM Sleep
  • Discovered by Eugene Aserinsky in 1953, REM sleep occurs during wild brain activity.
  • Characteristics:
    • Elevated heart rate and rapid breathing.
    • Sleep paralysis prevents movement during dreams, enhancing safety.
    • Physical arousal occurs, unrelated to dream content.
NREM Sleep
  • Consists of three stages:
    • Stage N1: Light sleep with alpha and theta waves.
    • Stage N2: Deeper sleep with sleep spindles evident.
    • Stage N3: Slow-wave sleep marked by delta waves, indicating the deepest sleep.
  • Sleep cycles last about 90 minutes, transitioning from N1 to N2 to N3 back to N2 and then to REM.
Brainwave Patterns
  • Beta Waves: Indicate alert, awake state.
  • Alpha Waves: Indicate relaxation and drowsiness.
  • Theta Waves: Associated with light sleep (N1, N2).
  • Delta Waves: Present during deep sleep (N3).

Consequences of Sleep Deprivation

Effects on the Brain

  • Reduced focus and memory consolidation, referred to as 'brain fog'.
  • Increased depression risk, particularly for those with prior vulnerability.

Physical Effects

  • Immune System: Suppression of immune function increases vulnerability to infections (e.g., colds).
  • Heart: Higher risk of high blood pressure due to increased workload during wakefulness.
  • Hunger: Increased ghrelin production and decreased leptin levels lead to heightened hunger, particularly cravings for unhealthy foods.
  • Fat Cells: Increased production correlates with obesity risks.
  • Joints: Fatigue leads to inflammation and arthritic symptoms, often causing morning stiffness from inadequate sleep.
  • Muscles: Reduced strength and slower reaction times result from lack of rest.

Dreams

Definition and Characteristics

  • Dreams consist of sequences of images, emotions, and thoughts experienced during sleep.
  • They often incorporate real-world stimuli and are influenced by recent traumatic events or frequent experiences.

Myths Surrounding Sleep

  1. Alcohol before bed helps sleep: While it may aid initial sleep, it disrupts sustained sleep.
  2. Yawning indicates exhaustion: The reason for yawning is not fully understood; theories include oxygen needs or brain temperature regulation.
  3. Everyone needs eight hours of sleep: Sleep needs vary per individual; some may need more or less.
  4. Catching up on sleep on weekends offsets sleep loss: Sleep recovery over the weekend is generally ineffective.
  5. Snoozing improves rest: It's better to get up with the alarm and possibly nap later for rejuvenation.
  6. Sleep aids are completely safe: Sleep aids should be used carefully due to potential risks.

Psychoactive Drugs and Consciousness Alteration

Definitions

  • Psychoactive drugs: Substances that alter mental processes, affecting perception, mood, cognition, and behavior.
    • Risks arise from dependence and addiction, leading to potential harm.

Dependence Types

  • Physical Dependence: The body adapts, causing cravings and withdrawal symptoms when the drug is stopped.
  • Psychological Dependence: A reliance on drugs for daily coping, creating a cycle of need for function in social or personal contexts.

Signs of Dependence

  • Using more than intended.
  • Failed attempts to regulate use.
  • Preoccupation with substance use.
  • Reduced participation in important activities.
  • Continued use despite negative consequences.

Tolerance and Withdrawal

  • Tolerance: The body's increased requirement for a substance to attain the desired effect.
  • Withdrawal: Physical symptoms experienced after stopping use, often causing further use to alleviate discomfort.

Depressant Drugs

Definition

  • Depressants: Substances that slow down brain activity, affecting the central nervous system.
Common Types of Depressants
  1. Alcohol: Impairs memory and judgment; risk of fatal slowing of the nervous system when mixed with other depressants.
  2. Barbiturates: Often prescribed as sedatives and for anxiety; serious risks when combined with alcohol.
  3. Opioids: Highly addictive, effective for pain relief but greatly risk dependence, especially among adolescents.

Stimulant Drugs

Definition

  • Stimulants: Drugs that increase neural activity, leading to heightened physiological responses (e.g., heart rate, blood pressure).
Types of Stimulants
  1. Caffeine: Most widely used stimulant, potentially disrupting sleep.
  2. Nicotine: Causes addiction, stimulating the brain and affecting appetite.
  3. Cocaine: Provides intense euphoria but leads to severe crash and potential for addiction.
  4. Methamphetamine: Highly addictive, causing increased energy and social connection, alongside severe health risks.
  5. Ecstasy (MDMA): Creates feelings of intimacy and can cause dehydration and overheating, leading to adverse health effects.

Hallucinogens

Definition

  • Hallucinogens: Drugs that alter sensory perceptions and experience distortions.
Examples
  1. LSD: Extremely potent, producing significant changes in sensation and perception.
  2. THC: Primary active ingredient in marijuana, mildly hallucinogenic.

Factors Contributing to Drug Use

Biopsychosocial Approach

Biological Factors
  • Genetic predisposition for substance abuse tied to family history.
  • Variations in neurotransmitter systems affecting addiction potential.
Psychological Factors
  • Lack of purpose or belonging.
  • Significant stress levels leading to self-medication.
  • Undiagnosed psychological disorders prompting reliance on substances.
Social and Cultural Influences
  • Difficult environmental conditions and accessibility of drugs.
  • Cultural acceptance affecting early drug use initiation and patterns.

Questions and Review

  • Students encouraged to ask questions regarding exam content and preparation strategies.
  • Discussion surrounding the upcoming exam and strategies for effective studying.