Stage 4 sleep begins when
A) dreams begin.
B) more than 50 percent of brain activity is delta waves.
C) delta waves begin to appear.
D) one first falls asleep.
Correct Answer:
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Q42: Which age group has the most difficulty
Q43: Sleep cycles last approximately
A) 45 minutes.
B) 60
Q44: The stage of sleep in which most
Q45: The brain waves that occur in Stage
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Q48: About 50% of a night's sleep is
Q49: The deepest sleep is called
A) Stage 4.
B)
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Q51: Which of the following groups has the
Q52: Which of the following groups spends many
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