Emily is currently in Stage 1 sleep. This means she is
A) experiencing theta waves and light sleep.
B) experiencing delta waves and walking in her sleep.
C) relaxed but awake.
D) hard to rouse and her muscles are completely relaxed.
Answer: A
Rationale: In Stage 1, brain waves slow down and become higher in amplitude—these are known as theta waves. Breathing, blood pressure, and heart rate all decrease slightly as an individual begins to sleep, but this is the lightest of the first four stages of sleep, making it fairly easy to rouse someone in this stage.
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