Q: Which formula best represents the frequency range of alpha activity observed in EEG recordings during relaxed wakefulness?

$$8 \leq f \leq 12 \, \text{Hz}$$

Question 1

Which stage of sleep is characterized by rapid eye movements, vivid dreams, and temporary paralysis of the body?

Accepted Answer

Stage REM (Rapid Eye Movement Sleep)

Question 2

A patient reports experiencing vivid, dream-like hallucinations just before falling asleep, sometimes accompanied by temporary paralysis. Which sleep disorder is most likely responsible for these symptoms?

Accepted Answer

Narcolepsy

Question 3

Which physiological measurement is used to detect muscle activity during sleep?

Accepted Answer

Electromyogram (EMG)

Question 4

During which sleep stage does the body experience the highest threshold for awakening and is most difficult to arouse?

Accepted Answer

Stage N3 (Deep Sleep / Slow wave sleep)

Question 5

Which neurotransmitter deficiency is most closely associated with narcolepsy and its symptoms such as cataplexy and sleep paralysis?

Accepted Answer

Hypocretin (Orexin)

Question 6

A shift worker who frequently changes between day and night shifts is most likely to experience disturbances in which physiological system?

Accepted Answer

Circadian rhythm

Question 7

Which hormone is known as the 'hormone of darkness' and helps regulate sleep onset?

Accepted Answer

Melatonin

Question 8

A person who leaves their bed and eats food while sleepwalking, with no memory of the event, is most likely experiencing which sleep disorder?

Accepted Answer

Sleep-related eating disorder

Question 9

Which sleep stage is most important for physical restoration and growth hormone secretion?

Accepted Answer

Stage N3 (Slow-wave sleep)

Question 10

A student stays awake for 72 hours and then sleeps for 15 hours. According to sleep deprivation studies, which sleep stages are most likely to be 'made up' during recovery sleep?

Accepted Answer

Stage N3 (Slow-wave sleep) and REM sleep

Question 11

Which of the following best describes the function of REM sleep?

Accepted Answer

Memory consolidation, learning, and mood regulation

Question 12

A patient with insomnia is found to have elevated cortisol levels at night. Which physiological axis is most likely overactive in this patient?

Accepted Answer

Thalamic-pituitary-adrenal (HPA) axis

Question 13

Which of the following is a plausible effect of disrupted slow-wave sleep?

Accepted Answer

Fatigue and poor stress regulation

Question 14

Which brain structure is considered the master clock for circadian rhythms?

Accepted Answer

Suprachiasmatic nucleus (SCN)

Question 15

A person experiences muscle paralysis during waking hours, often triggered by strong emotions such as laughter or anger. What is this phenomenon called?

Accepted Answer

Cataplexy

Question 16

Which of the following best explains why melatonin tablets are prescribed to people suffering from jet lag?

Accepted Answer

To rebalance circadian rhythm disturbances caused by changes in the sleep-wake cycle

Question 17

Which formula best represents the frequency range of alpha activity observed in EEG recordings during relaxed wakefulness?

Accepted Answer

$$8 \leq f \leq 12 \, 	ext{Hz}$$

Question 18

Which sleep stage is most associated with the presence of sleep spindles and K-complexes in EEG recordings?

Accepted Answer

Stage N2

Question 19

A patient with depression is treated with intentional sleep deprivation (wake therapy). What is the proposed mechanism by which this treatment alleviates depressive symptoms?

Accepted Answer

It prevents the accumulation of a 'depressogenic' chemical produced during sleep

Question 20

Which of the following best describes the effect of REM sleep deprivation?

Accepted Answer

It produces an independent REM sleep debt that must be recovered

Sleep and Biological Rhythms: Physiology, Stages, and Disorders

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