Why is rem sleep sometimes called paradoxical sleep? a. the paradox lies in the fact that rem sleep is known for its relation to dreaming, but when people are awakened during the rem stage, they are highly unlikely to be aware that they have been dreaming. b. the paradox lies in the fact that no dreaming can occur during rem sleep. c. the paradox lies in the fact that some parts of the brain are more active during rem sleep than they are during wakefulness. d. the paradox lies in the fact that the longer you sleep, the less frequent rem stages become?