Your Job Is to Monitor the EEG Recordings of a Patient

Your job is to monitor the EEG recordings of a patient in a sleep laboratory. You observe that the patient's brain waves change from about 14 cycles per second (cps) to 8-12 cps and then to 3-7 cps. What changes, if any, have likely occurred in the patient?

A) First the patient was deeply asleep, then lightly asleep, then awake.
B) The patient moved progressively from stage 1 to stage 3 sleep.
C) First the patient was awake, then relaxed, then in stage 1 sleep.
D) The patient was awake through all the changes in brain wave patterns.