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This is Scientific American 60-Second Mind, I'm Christie Nicholson.Got a minute?

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In his play Macbeth, Shakespeare wrote that sleep “...knits up the raveled sleep of care."

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So why would anyone want to be purposely reminded of a fearful memory while sleeping?

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Strange as it may seem, recent research shows that reminders of a scary memory while snoozing may help treat phobias.

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Scientists showed volunteers two faces while the volunteers received mild electric shocks.

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As they viewed a face, the subjects also smelled a specific odor, like clove, mint or lemon.

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So both the face and the odor were associated with the unpleasant experience of being shocked.

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Later, when subjects were in deep sleep they were exposed to one of the odors.

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When they woke up, they viewed images of the two faces.

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And their fear reaction to the face associated with the smell was lower than when they saw the other face.

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Fear was quantified via brain scans and sweat measurement.

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The study is the journal Nature Neuroscience.

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It's known that people can overcome phobias by exposure to the feared object or behavior while awake.

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But this study marks the first time scientists have tried exposure albeit through a conditioned response during sleep to reduce fear.

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And for phobic people, it could be a dream come true.

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Thanks for the minute, for Scientific American 60-Second Mind. I'm Christie Nicholson.

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