1. A person in Stage-2 sleep had an electrode implanted in his brain stem in a part of the reticular activating system. If an electrical current is sent through this electrode, which of the following is MOST likely to happen?

A. He will enter slow-wave sleep.
B. He will wake up.
C. He will begin to act out his dreams.
D. He will experience a sleep terror.

2. A group of people are participants in a study in which, for several months in a row, they are allowed to get only four hours of sleep per night. At the end of this time, they will be allowed to sleep as long as they want. Which of the following is most likely to happen?

A. Many will sleep LESS per night than they did before participating in the study.
B. Many will sleep MORE per night than they did before participating in the study.
C. Many will need LESS REM sleep but MORE NREM sleep than they did before participating in the study.
D. Many will need MORE REM sleep but LESS NREM sleep than they did before participating in the study.

3. Malcolm has not slept for three nights in a row. Which of the following problems is he LEAST likely to experience?

A. falling into short periods of light sleep
B. having unusual perceptual experiences
C. experiencing difficulty concentrating on interesting or fun tasks
D. He is unlikely to experience any of these problems.

4. When it gets dark outside, the production of which of the following hormones increases, thereby causing us to feel sleepy?

a. melatonin
b. serotonin
c. ghrelin

5. Which theory states that the purpose of sleep is to replenish bodily resources that have been depleted during the day?

A. restorative theory
B. energy-conservation theory
C. predation theory

6. The pons is a structure in the brainstem that seems to be important for initiating _____ sleep.

A. Stage 1
B. Stage 2
C. slow-wave
D. REM

7. What is the strongest and most reliable psychological effect of total-sleep deprivation in humans?

A. trouble concentrating
B. sleepiness
C. hallucinations
D. depression

8. Babies sleep much longer each day than adults do. Babies also have much higher metabolisms than adults. Which theory of sleep is most consistent with these two facts?

A. restorative theory
B. energy-conservation theory
C. predation theory

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