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The Sleep Cycle. Unit 3 Lesson 2. Objectives:. Define sleep Identify the main theories of sleep Differentiate between the stages of sleep. Warm Up. Describe two of the five different levels of consciousness we talked about yesterday. What Is Sleep?.

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The sleep cycle l.jpg

The Sleep Cycle

Unit 3

Lesson 2

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  • Define sleep

  • Identify the main theories of sleep

  • Differentiate between the stages of sleep

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Warm Up

  • Describe two of the five different levels of consciousness we talked about yesterday.

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What Is Sleep?

  • An altered state in which people become relatively unaware of external stimulation

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Studying Sleep

  • (1953) EEG records brain wave activity

    • Frequency and strength

  • EOG record eye movements

  • EMG record muscle movements

  • EKG records activity of the heart

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Online Activity

  • Use PsychSim 5.0 “EEG & Sleep Stages” at

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EEG and Sleep Stages

  • Awake = Beta Waves

  • Stage 1 = Theta Waves

    • Hypnagogic State

  • Stage 2 = Theta Waves

    • Sleep Spindles

  • Stage 3 = Delta Waves

  • Stage 4 = Delta Waves

    • Bedwetting, Sleep talk/walk

    • Night Terrors

  • REM = Mimic’s Beta Waves

    • Atonia, DREAMING!

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Sleep Cycle

  • Roughly 5 periods of REM sleep per night

    • Sleep becomes lighter as night wears on

    • REM sleep becomes longer towards am

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Why Do We Sleep?

  • Evolutionary Theory: Protective function, keeps people tucking away at night, safe from predators.

  • Recuperative Theory: Conserves energy, restores body tissues depleted during daily activity

    • REM: hormones released that influence thinking & memory formation, mental organization; counteract fatigue, irritability, inattention

    • NREM: body replenishes itself (tissue restoration and release of growth hormone)

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Why Do We Sleep At Night?

  • Circadian Rhythm

    • Internally generated sleep/wake cycle connected to 24-hour pd of earth’s rotation

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How Much Sleep Do I Need?

  • Infants

    • 20 hours

      • 50% REM

  • Children/Adolescents

    • 10 hours

      • 25-30% REM

    • Bed Later, Up Later

  • Adults

    • 8 hours

      • 20% or less REM

  • Elderly

    • 6 hours

    • Bed Later, Up Earlier

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Effects On Body

Immune system weakens

Metabolic malfunction

Varied body temp

Effects On Brain


Decreased cognitive performance

Learn slower, remember less, loss concentration & creativity

Blurred vision

Disorganized speech


What If I Miss Sleep?

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Sleep Activities

  • Am I Sleep Deprived?

  • Sleep Myths Quiz

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Am I Sleep Deprived? Yes/No

  • I need an alarm clock to wake up for school.

  • It’s a struggle to get out of bed in the morning.

  • I hit the snooze bar several times to get more sleep.

  • I feel tired, irritable and stressed out during the week.

  • I have trouble concentrating and remembering.

  • I feel slow with critical thinking, problem solving and being creative.

  • I often fall asleep in boring classes or warm rooms.

  • I often fall asleep within 5 minutes of getting into bed.

  • I often feel drowsy while driving.

  • I often sleep extra hours on weekend mornings.

  • I often need a nap when I get home from school.

  • I have pink circles around or dark circles under my eyes.

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Am I Sleep Deprived? Yes/No

  • An answer of “yes” to three or more of the previous questions indicates sleep deprivation.

  • You can easily improve your mood, performance and health by getting more sleep!

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  • How has sleep deprivation affected your life? Which activities contribute most to your sleep deprivation?