Breathing Fragrances While Sleeping Boosts Memory and Learning

The scientists assigned the participants to one of two groups. Over the course of six months, the first group received one of seven diffused essential oils rotating nightly. The essential oils used were rose, orange, eucalyptus, lemon, peppermint, rosemary, or lavender. The second control group received nothing other than a substance with minimal scent. Participants were asked to turn the diffuser on when they went to bed, and the fragrance was released for the first two hours of their sleep.

To determine progress, the researchers conducted a series of tests at the beginning and end of the trial. These included brain assessments and a memory assessment called the Rey Auditory Verbal Learning Test. 

Finally, they tested participants’ working memory, planning, attention switching, and sense of smell. The results showed a significant 226% improvement on the Rey Auditory Verbal Learning Test in participants who had breathed fragrance at night. Scientists also noted improvement in a part of the brain associated with language function.

The study drew on prior research on mice that showed daily exposure to scents can improve memory. In particular, the scientists knew they should try fragrances individually rather than as mixtures because single fragrances are more likely to have a positive effect. Scientists have also understood the connection between the sense of smell and brain health from previous studies. Knowing these two things and that memory loss is a growing problem for older populations, Trusted Source National Library of Medicine, Biotech Information The National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information. View Source researchers wanted to find affordable yet effective treatments that aging adults could manage on their own.

Memory loss in the United States is a common problem. In fact,  40% of people over 65 report some form of memory issue. This amounts to nearly 16 million Americans, with about 1% progressing to dementia. Trusted Source National Library of Medicine, Biotech Information The National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information. View Source  

This study adds to scientists’ knowledge of the benefits of exposure to certain fragrances, and these positive findings may prompt additional, more extensive studies involving more participants. Meanwhile, older adults can try this simple, affordable option for boosting their memory—one they can consider from the privacy of their homes.