[单项选择] Of all the components of a good night’ s sleep, dreams seem to be least within our control. In dreams, a window opens into a world where logic is suspended and dead people speak. A century ago, Freud formulated his revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears; by the late 1970s, neurologists had switched to thinking of them as just "mental noise"―the random byproducts of the neural - repair work that goes on during sleep. Now researchers suspect that dreams are part of the mind’ s emotional thermostat, regulating moods while the brain is "off - line." And one leading authority says that these intensely powerful mental events can be not only harnessed but actually brought under conscious control, to help us sleep and feel better. "It’ s your dream," says Rosalind Cartwright, chair of psychology at Chicago’ s Medical Center. "If you don’ t like it, change it." Evidence from brain imaging supports this view. The brain is as active
A. its function in our dreams.
B. the mechanism of REM sleep.
C. the relation of dreams to emotions.
D. its difference from the prefrontal cortex.

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