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"Scents, pleasing or foul, can influence people's emotional state\u2014even during sleep. Michael Schredl, a researcher at the Central Institute of Mental Health in Mannheim, Germany, and his colleagues recruited 15 women to spend the night in a lab. Each time the participants entered rapid eye movement (REM) sleep, in which dreaming occurs, the researchers exposed them to a neutral aroma, the scent of roses, or the smell of rotten eggs. After a minute, they woke the women and asked them about their dreams. The women did not report explicit scenarios of smelling something, but their dreams' emotional tone clearly reflected the positive or negative nature of the scent to which they'd just been exposed. It would be interesting to investigate whether aromatherapy could help alleviate nightmares, the researchers muse."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.allure.com/story/sleep-scents>