Leon has procrastinated, and is cramming in an attempt to memorize a great deal of material for his final exams. finished at last, he goes to bed. unfortunately, his next-door neighbor has a noisy, barking dog. the barking interrupts leon's sleep cycle, especially during rem sleep. the next day leon does very poorly on his exams. according to the information-processing theory of dreams, one explanation for his poor performance (in addition to his study habits) is that: