AP Psychology Quiz: Sleep
20 questions · exam conditions
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SleepQuestion 1 of 20

Which sequence best represents typical progression after sleep onset in the first cycle?

REM → NREM-3 → NREM-2 → NREM-1, because dreaming begins first and then deep sleep slowly develops.
NREM-1 → NREM-2 → NREM-3 → back toward lighter sleep → REM, reflecting a normal first 90-minute cycle.
NREM-3 → NREM-2 → NREM-1 → REM, because deep delta sleep happens immediately upon closing the eyes.
NREM-2 → REM → NREM-1 → NREM-3, because spindles trigger REM and then the brain resets to deep sleep.
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AP Psychology Quiz

AP Psychology Quiz: Sleep

Practice Sleep in AP Psychology with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Sleep, giving you a quick way to practice the rules, question types, and explanations that matter most for AP Psychology.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Which sequence best represents typical progression after sleep onset in the first cycle?

  1. REM → NREM-3 → NREM-2 → NREM-1, because dreaming begins first and then deep sleep slowly develops.
  2. NREM-1 → NREM-2 → NREM-3 → back toward lighter sleep → REM, reflecting a normal first 90-minute cycle. (correct answer)
  3. NREM-3 → NREM-2 → NREM-1 → REM, because deep delta sleep happens immediately upon closing the eyes.
  4. NREM-2 → REM → NREM-1 → NREM-3, because spindles trigger REM and then the brain resets to deep sleep.
Explanation: The typical progression in the first sleep cycle begins with NREM-1 (light transition sleep), progresses through NREM-2 (stable light sleep with spindles and K-complexes), deepens into NREM-3 (slow-wave sleep), then lightens back toward NREM-2 before entering the first REM episode. This sequence reflects the natural progression from wakefulness through increasingly deeper NREM stages, followed by the first REM period that completes the initial 90-minute cycle. The pattern demonstrates how sleep naturally deepens during the first part of the night when homeostatic sleep pressure is highest, allowing for maximal slow-wave sleep early in the sleep period. Subsequent cycles show similar patterns but with less NREM-3 and progressively longer REM episodes. This architecture optimizes both the restorative functions of deep sleep early in the night and the memory consolidation functions of REM sleep throughout multiple cycles.

Question 2

Which sleep stage is most associated with vivid dreaming and memory consolidation, while EEG resembles wakefulness?

  1. NREM-3 sleep, because delta waves resemble wakefulness and vivid dreams occur primarily during slow-wave sleep with highest muscle tone.
  2. NREM-2 sleep, because sleep spindles produce rapid eye movements and muscle atonia; vivid dreaming is exclusive to this spindle-rich stage.
  3. NREM-1 sleep, because hypnagogic hallucinations represent the most vivid dreaming; EEG becomes fast and desynchronized like alert wakefulness.
  4. REM sleep, with rapid eye movements, muscle atonia, and an EEG resembling wakefulness; vivid dreams are common and memory processing is supported. (correct answer)
Explanation: REM sleep is uniquely associated with vivid, narrative-like dreams and plays crucial roles in memory consolidation, particularly for emotional and procedural memories. During REM, the EEG shows fast, low-amplitude, desynchronized waves remarkably similar to waking brain activity, earning it the name "paradoxical sleep." This high brain activity supports complex dream imagery and memory processing, while neurotransmitter changes (reduced serotonin, norepinephrine, and histamine) may facilitate creative connections between disparate memories. The hippocampus shows distinctive theta rhythms during REM that support memory transfer to cortical storage. REM sleep increases after learning new skills or emotional experiences, and REM deprivation impairs performance on these tasks. The combination of high brain activity, vivid dreams, rapid eye movements, and muscle atonia makes REM sleep distinct from all NREM stages.

Question 3

Which best describes the role of zeitgebers in circadian rhythms?

  1. They are external time cues, like light, that help synchronize internal circadian clocks to the environment. (correct answer)
  2. They are brain waves unique to REM sleep that cause vivid dreams and rapid eye movements.
  3. They are sleep spindles that block sensory input and keep the sleeper from waking during NREM-2.
  4. They are hormones released only in NREM-3 that force the body into deep sleep at a fixed time nightly.
Explanation: Zeitgebers are external environmental cues that help synchronize internal circadian clocks to the 24-hour day-night cycle. The term comes from German, meaning 'time givers,' and describes stimuli that provide timing information to the circadian system. Light is the strongest zeitgeber for humans, particularly morning sunlight that helps reset the SCN and maintain proper circadian timing. Other zeitgebers include meal timing, social activities, exercise, and temperature changes. These cues help overcome the natural tendency of human circadian rhythms to drift slightly longer than 24 hours when running freely. Consistent exposure to zeitgebers maintains stable sleep-wake patterns and optimal circadian function. Disruption of zeitgebers, as occurs with shift work or travel across time zones, can lead to circadian rhythm disorders and associated sleep problems.

Question 4

Light information from the retina most directly helps reset circadian rhythms by influencing which structure?

  1. The thalamus, which resets circadian rhythms by filtering sensory input and generating sleep spindles in NREM-2.
  2. The pons, which resets circadian rhythms by triggering REM sleep and producing rapid eye movements each night.
  3. The suprachiasmatic nucleus (SCN), which receives retinal input and adjusts the body's daily timing signals. (correct answer)
  4. The medulla, which resets circadian rhythms by slowing breathing and heart rate during deep NREM-3 sleep.
Explanation: Light information from the retina directly influences the suprachiasmatic nucleus (SCN) through a specialized pathway called the retinohypothalamic tract. Specialized retinal ganglion cells containing the photopigment melanopsin detect light intensity and send signals directly to the SCN, bypassing the visual cortex. This light input is the primary zeitgeber (time cue) that resets and synchronizes the body's circadian clock to the 24-hour light-dark cycle. When light hits these retinal cells, particularly blue light, it suppresses melatonin production and shifts circadian timing. This is why bright light exposure in the evening can delay sleep onset, while morning light exposure helps maintain normal circadian timing. The SCN then coordinates circadian rhythms throughout the body via neural and hormonal signals.

Question 5

Which best distinguishes sleep apnea from insomnia based on typical symptoms?

  1. Sleep apnea primarily involves airway obstruction and oxygen drops; insomnia primarily involves difficulty initiating or maintaining sleep. (correct answer)
  2. Sleep apnea involves sudden REM onsets and cataplexy; insomnia involves loud snoring and gasping awakenings.
  3. Sleep apnea is defined by sleepwalking in NREM-3; insomnia is defined by acting out dreams in REM sleep.
  4. Sleep apnea is inability to enter NREM-2; insomnia is inability to produce delta waves during NREM-3.
Explanation: Sleep apnea primarily involves repeated airway obstruction leading to breathing interruptions, oxygen desaturation, and sleep fragmentation, while insomnia primarily involves persistent difficulty initiating or maintaining sleep despite adequate sleep opportunity. Sleep apnea is a physiological disorder caused by upper airway collapse that results in loud snoring, gasping awakenings, and excessive daytime sleepiness due to fragmented sleep architecture. Insomnia is characterized by subjective sleep difficulty, often involving racing thoughts at bedtime, frequent awakenings, or early morning awakening with inability to return to sleep. Sleep apnea typically requires medical treatment like CPAP therapy to maintain airway patency, while insomnia often responds to behavioral interventions like cognitive-behavioral therapy. Both conditions can cause daytime fatigue, but the underlying mechanisms and treatment approaches differ significantly based on whether the primary problem is airway obstruction or sleep initiation/maintenance difficulty.

Question 6

Across a typical night, how does REM sleep duration usually change from early to late cycles?

  1. REM periods generally lengthen across the night, with shorter REM early and longer REM episodes toward morning. (correct answer)
  2. REM occurs only once, after the first 90 minutes, and then disappears as the night progresses.
  3. REM is longest in the first cycle and steadily shortens, while NREM-3 becomes increasingly dominant near morning.
  4. REM is absent in healthy adults; dreaming occurs exclusively in NREM-3 during delta-wave sleep.
Explanation: REM sleep periods generally become longer and more frequent across the night, with shorter REM episodes early in sleep and progressively longer ones toward morning. This pattern reflects the interaction between circadian rhythms and homeostatic sleep pressure. Early in the night, when sleep pressure is highest, NREM-3 (deep sleep) dominates the cycles. As sleep pressure decreases and morning approaches, REM sleep becomes more prominent and episodes can last 30-45 minutes. This REM sleep architecture is important for different types of memory consolidation and dreaming. The ultradian rhythm of approximately 90-minute cycles continues throughout the night, but the proportion of REM within each cycle increases toward morning hours.

Question 7

After 24 hours awake, a student shows irritability, slowed reaction time, and microsleeps. What best explains this?

  1. Sleep deprivation impairs attention and executive function, increasing reaction time and moodiness; brief microsleeps can intrude when sleep pressure is high. (correct answer)
  2. REM rebound eliminates daytime fatigue by increasing alertness; therefore prolonged wakefulness typically improves reaction time and reduces irritability.
  3. Circadian entrainment to light fully prevents performance decline; staying awake longer strengthens the suprachiasmatic nucleus and reduces microsleeps.
  4. NREM-3 increases during wakefulness, producing delta waves while awake; these delta waves directly cause improved memory and faster reactions.
Explanation: Sleep deprivation severely impairs cognitive and emotional functioning through multiple mechanisms. After 24 hours without sleep, the brain struggles to maintain attention and executive control, leading to slowed reaction times, poor decision-making, and increased errors. Microsleeps - brief episodes of sleep lasting 1-10 seconds - occur involuntarily as the brain attempts to satisfy its sleep drive. These can be dangerous during activities like driving. Sleep pressure builds up due to accumulating adenosine in the brain, which promotes sleepiness and is only cleared during sleep. Mood regulation also suffers, causing irritability, emotional volatility, and decreased stress tolerance. The prefrontal cortex, responsible for rational thinking and impulse control, is particularly vulnerable to sleep loss. Extended sleep deprivation can even cause hallucinations and paranoia.

Question 8

A person works overnight shifts and sleeps during the day; their main problem reflects disruption of what?

  1. Circadian rhythms, because sleep timing conflicts with the light-dark cycle and the SCN's synchronized daily patterns. (correct answer)
  2. REM atonia, because shift work eliminates muscle paralysis and causes the worker to act out dreams at work.
  3. Sleep spindles, because night work prevents NREM-2 and forces the brain into continuous NREM-1 sleep.
  4. Delta-wave production, because working at night permanently removes NREM-3 from the sleep cycle in adults.
Explanation: Overnight shift workers experience disruption of their circadian rhythms because their work schedule conflicts with the natural light-dark cycle and the SCN's endogenous timing signals. The circadian system evolved to promote wakefulness during daylight hours and sleepiness during darkness, but shift work requires alertness when the biological clock signals for sleep. This creates a persistent mismatch between required wake times and internal circadian timing, leading to shift work sleep disorder. The SCN continues to receive light cues that don't align with the desired sleep schedule, making adaptation difficult. Daytime sleep is often lighter and less restorative than nighttime sleep due to circadian influences on sleep architecture, noise, and light exposure. The chronic circadian misalignment can lead to excessive sleepiness, reduced performance, and health problems including increased risk of cardiovascular disease and metabolic disorders.

Question 9

During which sleep stage do rapid eye movements and near-complete skeletal muscle atonia typically occur?

  1. NREM-2 sleep, marked by sleep spindles and K-complexes, with reduced muscle tone but no characteristic rapid eye movements.
  2. REM sleep, characterized by rapid eye movements, vivid dreaming, and muscle atonia that prevents most voluntary movement. (correct answer)
  3. NREM-3 sleep, dominated by delta waves and the deepest sleep, with no rapid eye movements and minimal dreaming.
  4. NREM-1 sleep, a brief transition with theta activity and hypnic jerks, but without sustained muscle atonia.
Explanation: REM sleep is characterized by rapid eye movements, vivid dreaming, and near-complete skeletal muscle atonia (paralysis). During REM sleep, the brain is highly active with EEG patterns resembling wakefulness, but the body experiences temporary paralysis that prevents acting out dreams. This muscle atonia is a protective mechanism that keeps us from physically responding to dream content. REM sleep occurs in cycles throughout the night, typically becoming longer and more frequent toward morning. In contrast, NREM stages have varying degrees of muscle tone but lack the characteristic rapid eye movements and complete muscle paralysis seen in REM.

Question 10

Why does late-night screen time lower melatonin?

  1. Cortisol lowers pineal output
  2. Sleep pressure halts melatonin
  3. Melatonin peaks only in REM
  4. SCN light signal slows pineal (correct answer)
Explanation: Late-night light reaches your retina and sends a signal through the suprachiasmatic nucleus (SCN), which tells the pineal gland to slow melatonin production. That's why screen use before bed disrupts sleep. The tempting wrong answer is cortisol lowering pineal output, but cortisol is a stress hormone, not the light-signaling pathway.

Question 11

A sleepwalking child recalls no dream. This most likely occurs during

  1. REM sleep, near morning
  2. N3 sleep, early in the night (correct answer)
  3. N2 sleep, after each REM
  4. N1 sleep, just after waking
Explanation: Sleepwalking arises from deep slow-wave sleep, which dominates early in the night. That stage is N3, not REM, so the child has no dream to recall. REM near morning is tempting because dreams happen there, but REM also paralyzes muscles and is not tied to sleepwalking.

Question 12

After 30 hours awake, recovery sleep is mostly N3. This best illustrates

  1. REM rebound from lost sleep
  2. Homeostatic pressure for N3 (correct answer)
  3. A delayed circadian phase
  4. A shift in melatonin release
Explanation: Staying awake 30 hours builds homeostatic sleep pressure, and the brain prioritizes deep N3 slow-wave sleep first to recover. REM rebound is the tempting wrong answer because it also follows sleep loss, but REM rebound shows up on later nights, not as the immediate N3-heavy recovery sleep.

Question 13

Compared with the first, the last sleep cycle usually has

  1. Longer REM and less N3 (correct answer)
  2. Longer N3 and less REM
  3. Equal N3 and shorter REM
  4. Extended N2 and no REM
Explanation: Early sleep cycles pack in N3 slow-wave sleep, but as the night goes on N3 fades and REM stretches longer. So the last cycle ends with longer REM and less N3. The tempting wrong answer is the reverse, thinking sleep deepens, but N3 is front-loaded.

Question 14

A drug blocks all REM but leaves memory intact. This most directly weakens the claim that

  1. REM is controlled by the SCN
  2. N3 sleep restores the body
  3. REM is necessary for memory (correct answer)
  4. Dreams express hidden wishes
Explanation: Blocking all REM while memory stays intact shows memory can survive without REM, so the claim that REM is necessary for memory fails. The tempting wrong answer is that dreams express hidden wishes, but that concerns dream content, not whether REM is required for remembering.

Question 15

How do we know dreaming can occur outside REM?

  1. REM loss causes sleepiness
  2. Dreams replay waking memories
  3. Infants have longer REM sleep
  4. NREM awakenings yield reports (correct answer)
Explanation: Dreaming is identified by dream reports, and when people are awakened during NREM sleep, they often report dreamlike experiences, showing REM isn't required. The tempting wrong answer is that dreams replay waking memories, but that describes dream content, not evidence that dreaming happens outside REM.

Question 16

After 40 hours awake, the first recovery sleep shows the largest rise in:

  1. REM sleep time
  2. Slow-wave sleep (correct answer)
  3. Stage 1 sleep
  4. Stage 2 sleep
Explanation: After prolonged wakefulness, your brain prioritizes restoring deep slow-wave sleep, so the first recovery night shows the biggest increase in stage 3 sleep. REM rebound is a tempting choice, but REM increases more on later recovery nights, not the first one.

Question 17

Which finding best supports the restorative theory of sleep?

  1. Tissue repair in deep sleep (correct answer)
  2. Dream recall is highest in REM
  3. Melatonin rises at bedtime
  4. Infants sleep more than adults
Explanation: Deep sleep is when the body increases tissue repair and growth hormone release, directly matching the restorative theory's claim that sleep rebuilds the body. The tempting wrong answer is dream recall being highest in REM, but that points to dreaming or memory processing, not physical restoration.

Question 18

A narcoleptic patient suddenly collapses whenever she laughs. This is caused by:

  1. REM atonia during wakefulness (correct answer)
  2. A seizure in the motor cortex
  3. Hyperventilation then fainting
  4. Sleep paralysis in deep sleep
Explanation: Laughter triggers cataplexy, where REM sleep's muscle paralysis intrudes while you're awake, causing sudden collapse. The tempting wrong answer is sleep paralysis in deep sleep, but that occurs during sleep transitions and isn't triggered by emotion like laughter.

Question 19

In activation-synthesis theory, dream content comes from:

  1. Safe rehearsal of threats
  2. Forbidden wishes in disguise
  3. Random impulses given meaning (correct answer)
  4. Synaptic pruning during REM
Explanation: During REM, random neural signals fire from the brainstem, and the cortex tries to make sense of them by weaving them into a story. That story is the dream's content. The tempting wrong answer is 'forbidden wishes in disguise,' which is Freud's wish-fulfillment theory, not activation-synthesis.

Question 20

Across a typical night, how do REM periods usually change from early to late sleep cycles?

  1. REM periods generally lengthen and become more frequent later in the night, while early-night sleep contains more NREM-3. (correct answer)
  2. REM occurs only in the first cycle and then disappears, because the brain completes dreaming needs early in the night.
  3. REM stays constant at about five minutes per cycle, because circadian rhythms prevent variation in stage durations overnight.
  4. REM is replaced by NREM-1 later in the night, because light sleep increases to prevent waking near morning.
Explanation: REM periods show a characteristic pattern of lengthening and increasing frequency as the night progresses. The first REM period typically occurs 70-90 minutes after sleep onset and lasts only 5-10 minutes. Subsequent REM periods grow progressively longer, with the final REM period potentially lasting 30-60 minutes. This REM distribution follows circadian influences—REM sleep propensity increases in the early morning hours when core body temperature is lowest. Conversely, NREM-3 (deep sleep) predominates in the first third of the night when homeostatic sleep pressure is highest. By the final sleep cycles, NREM-3 may be absent entirely, with cycles alternating primarily between NREM-2 and increasingly lengthy REM periods. This architecture ensures both restorative deep sleep early and REM-dependent processes like memory consolidation and emotional regulation later in the night.