Stage 2 non-REM sleep is characterized by the presence of which of the following? 1. Relatively low-voltage, mixed-frequency waves 2. Sleep spindles 3. Delta waves 4. K-complexes
a. 1 and 3 c. 1 and 4
b. 2 and 4 d. 2, 3, and 4
ANS: D
Stage 2 non-REM sleep is identified on a sleeper's electroencephalogram by the appearance of sleep spindles and K-complexes. Relatively low-voltage, mixed-frequency waves occur during non-REM stage 1 sleep. Delta waves are present during slow-wave sleep or non-REM sleep stages 3 and 4.
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