Tawny has been craving a Dr. Pepper soft drink all day. She is not sure why, because she rarely drinks this beverage. Her roommate, Abigail, reminds her that last night several friends they were out with were drinking Dr. Pepper. Which of the following has Tawny experienced?
a. sleep-related memory consolidation
b. subliminal perception
c. the global workspace model
d. a non-REM dream