FEATURESThe Effect of Aromatherapy Application on Cognitive Functions and Daytime Sleepiness in Older Adults Living in a Nursing HomeAydın Yıldırım, Tuğba PhD; Kitiş, Yeter PhDAuthor Information Department of Nursing, Faculty of Health Sciences, Karabuk University, Karabuk, Turkey (Dr Aydın Yıldırım); and Department of Nursing, Faculty of Health Sciences, Gazi University, Ankara, Turkey (Dr Kitiş). Correspondence: Tuğba Aydın Yıldırım, PhD, Department of Nursing, Faculty of Health Sciences, Karabuk University, Demir-Celik Kampusu 78050 Karabuk, Turkey (firstname.lastname@example.org). This research was presented as a poster paper on October 5 to 8, 2017, at the 5th International 16th National Nursing Congress in Ankara/Turkey.The authors have disclosed that they have no significant relationships with, or financial interest in, any commercial companies pertaining to this article. Holistic Nursing Practice: March/April 2020 - Volume 34 - Issue 2 - p 83-90 doi: 10.1097/HNP.0000000000000371 Buy Metrics Abstract Changes in the aging process affect the duration and quality of sleep. Not having a quality night's sleep leads to a reduction in daytime wakefulness in older adults. We examined the effect of aromatherapy on the cognitive functions and daytime sleepiness of older adults living in a nursing home. The research was a pretest and posttest design, which was conducted without a control group. The sample included 39 elders. A rosemary-lemon oil mixture was smelled by elders in the mornings for a week. After a 1-week washout period, lavender oils were smelled in the evenings for a week. After application of the rosemary-lemon oil mixture, the mean score of participants' daytime sleepiness was lower, but that decline was not statistically meaningful (P > .050). After the same application, the mean score of the participants' cognitive functions was significantly lower (P < .001). After application of lavender oil, the scores were significantly lower (P < .001). Lower scores on the scales used indicate lower sleepiness. The results showed that the 2 applications can be used to improve cognitive functions in older adults; in addition, lavender oil has an advantage in reducing daytime sleepiness. © 2020 Wolters Kluwer Health, Inc. All rights reserved.