Sarah Is Participating in a Sleep Study

Multiple Choice

Sarah is participating in a sleep study. Although she appears to be sleeping, her EEG pattern exhibits fast brain-wave activity, and the recording from the electrooculogram seems to indicate that she is moving her eyes. This suggests that Sarah:

A) is having a seizure.
B) is lying with her eyes closed and is relaxed but not actually sleeping.
C) has a sleep disorder.
D) is in REM sleep.