Evidence from brain imaging supports this view. The brain is as active during REM（rapid eye movement）sleep-when most vivid dreams occur-as it is when fully awake, says Dr, Eric Nofzinger at the University of Pittsburgh. But not all parts of the brain are equally involved, the limbic system（the“emotional brain”）is especially active, while the prefrontal cortex（the center of intellect and reasoning）is relatively quiet.“We wake up from dreams happy of depressed, and those feelings can stay with us all day”says Stanford sleep researcher Dr, William Dement.
And this process need not be left to the unconscious. Cartwright believes one can exercise conscious control over recurring bad dreams As soon as you awaken, identify what is upsetting about the dream. Visualize how you would like it to end instead, the next time is occurs, try to wake up just enough to control its course. With much practice people can learn to, literally, do it in their sleep.
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