During stage of sleep, muscle activity decreases with and conscious awareness of the outside world begins to fade completely. a) Stage 1 c) Stage 3 b) Stage 2 d) Stage 4
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Answer:
b) Stage 2
Explanation:
Muscle activity decreases in Stage 2 and conscious awareness of the outside world fades. Brain waves are mainly in the theta wave range but sleep spindles (short bursts of brain activity) and K-complexes (unique and brief waveforms) occur to protect sleep and suppress outside stimuli.
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