Carrie finds mrs. clark's psychology lecture to be boring and uninteresting. gradually, her muscles relax and drowsiness occurs. this drowsy but wakeful state is associated with brain waves.

This would be associated with Alpha brain waves. Alpha brain waves are a type that can be detected by either electroencephalography or magnetoencephalography. They ten to originate from the occipital lobe of the brain and often occur during a relaxed wakeful state, often with eyes closed. When the eyes are closed the occipital alpha waves send the strongest eeg brain signals.