Professor Tim Jacob, an expert in smell and taste at Cardiff University (UK), said:
"Smell is the only sense that doesn't 'sleep'. Information continues to reach the limbic system of the brain and that includes the hippocampus, or memory area and the amygdala, that is involved with emotional response.
"Other senses have to pass through the 'gate' of the thalamus, which is closed when we sleep."
When the smell of roses had been wafted under the noses of slumbering volunteers they reported experiencing pleasant emotions in their dreams.
....emotional tone of the dream did change depending on the (smell) stimulation.
BBC 22 September 2008
Illustrations: Fan Spray/Dream Smear Lura Astor
