Question 1

Which structure in the hypothalamus is primarily responsible for regulating circadian rhythms in humans?

Accepted Answer

Suprachiasmatic nucleus (SCN)

Question 2

A patient reports excessive daytime sleepiness and difficulty maintaining sleep at night. Which sleep disorder is most likely being described?

Accepted Answer

Insomnia

Question 3

Which of the following best describes the pattern of brain waves during deep Non-REM sleep?

Accepted Answer

Low-frequency delta waves

Question 4

Which of the following is a consequence of chronic sleep deprivation?

Accepted Answer

Decreased immune function

Question 5

Which theory suggests that dreams help us solve problems by processing unresolved issues?

Accepted Answer

Problem-focused approach

Question 6

During which stage of sleep do most vivid dreams occur, and what is the primary associated brain wave?

Accepted Answer

REM sleep; beta waves

Question 7

A researcher is measuring a subject's brain activity and observes predominantly alpha waves. What is the most likely state of the subject?

Accepted Answer

Awake but relaxed

Question 8

Which of the following is NOT a typical effect of stimulant drugs on the nervous system?

Accepted Answer

Decreased heart rate

Question 9

Which of the following equations best represents the relationship between sleep stages and time spent in each stage during a typical sleep cycle?

Accepted Answer

$T_{total} = T_{NREM1} + T_{NREM2} + T_{NREM3} + T_{REM}$

Question 10

A person is experiencing mood swings and depressive symptoms that coincide with the change of seasons. Which disorder is most likely present?

Accepted Answer

Seasonal affective disorder (SAD)

Question 11

Which of the following best explains the function of the suprachiasmatic nucleus (SCN) in sleep regulation?

Accepted Answer

It synchronizes the body's internal clock with environmental light-dark cycles.

Question 12

Which sleep stage is characterized by sleep spindles and K-complexes in the EEG?

Accepted Answer

Stage 2 Non-REM sleep

Question 13

Which of the following is a plausible effect of depressant drugs on the nervous system?

Accepted Answer

Slowed reaction time

Question 14

If a person is deprived of REM sleep for several nights, which of the following is most likely to occur?

Accepted Answer

REM rebound: increased REM sleep when allowed to sleep normally

Question 15

Which brain wave pattern is most associated with alert, focused mental activity?

Accepted Answer

Beta waves

Question 16

A person is observed to have slowed heart rate, decreased muscle tone, and delta waves on EEG. Which sleep stage are they most likely in?

Accepted Answer

Stage 3 Non-REM sleep

Question 17

Which of the following best describes the activation-synthesis theory of dreaming?

Accepted Answer

Dreams are random neural activity interpreted by the brain.

Question 18

Which of the following is a correct statement about the transition between sleep stages?

Accepted Answer

The transition from Non-REM to REM sleep typically occurs every 90 minutes.

Question 19

Which of the following formulas represents the calculation of total sleep time if a person cycles through 5 sleep cycles, each lasting 90 minutes?

Accepted Answer

$T_{sleep} = 5 	imes 90$

Question 20

A person is found unresponsive with slow breathing and pinpoint pupils. Based on these symptoms, which class of psychoactive substance is most likely involved?

Accepted Answer

Opioids

Sleep, Biological Rhythms, and Psychoactive Substances: Study Guide for Psychology Exam

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