Final answer:
An EEG of Cyrus right before he was awoken would likely have shown a preponderance of Theta waves.
Step-by-step explanation:
The EEG of Cyrus right before he was awoken would likely have shown a preponderance of Theta waves. Theta waves are low frequency (4-7 Hz) and high amplitude brain wave patterns that occur during the early part of NREM stage 1 sleep. As an individual continues through stage 1 sleep, there is an increase in theta wave activity.