The EEG tracing of the patient in the sleep laboratory shows that brain waves have slowed to about 1 to 2 cycles per second. In addition, breathing and heart rate have decreased. It is most likely that the patient is
a. in stage 1 non-REM sleep.
b. experiencing feelings of anxiety.
c. in stages 3 and 4 of sleep.
d. in paradoxical sleep.
Answer: c. in stages 3 and 4 of sleep.
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