We all know from experience how strongly scent and memories are connected. This study sheds an interesting new light on the topic, as it links fragrance association with learning process (memorization) as well as sleep patterns and the role of sleep in our processing and internalizing information.
Students who were exposed to the scent of roses while learning a new task and than exposed to the same scent during their deep sleep remember 15% more than students who did not have the scent/memory association and were not introduced to the scent again in that phase of sleep.