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Question 1: Which stage of sleep is characterized by the
presence of theta waves and the appearance of sleep
spindles and K-complexes on an EEG?
a) Stage 1
b) Stage 2
c) Stage 3
d) REM sleep
Answer: b) Stage 2
Rationale: Stage 2 sleep is characterized by the presence of
theta waves and the appearance of sleep spindles and Kcomplexes on an EEG. This stage represents approximately
45-55% of total sleep time and is essential for the
consolidation of memory and learning.
Question 2: Which stage of sleep is often referred to as
slow-wave sleep (SWS) and is characterized by the
presence of high-amplitude, low-frequency delta waves on
an EEG?
a) Stage 1
b) Stage 2
c) Stage 3
d) REM sleep
Answer: c) Stage 3
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