The sleep researcher William Dement awakened volunteers each time they entered REM sleep. Which of the following was NOT one of Dement's findings?
a. By the fifth night, many of the volunteers had to be awakened 20 to 30 times to prevent REM sleep.
b. During their waking hours, the volunteers, who were deprived of REM sleep, complained of memory lapses, poor concentration, and anxiety.
c. When volunteers were finally allowed to sleep undisturbed, they exhibited extra amounts of dream sleep.
d. After being REM sleep deprived, the volunteers exhibited more instances of sleep terrors and/or somnambulism.
ANSWER: d
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