In a recent study researchers investigated the effects of inhalation aromatherapy on sleep disturbance in elderly individuals with dementia. In 19 participants, normal sleep was observed for a 20-day control period, inhalation aromatherapy was then applied for a 20-day intervention period, and the control and intervention periods were compared. During the intervention period, essential oils were placed nightly on towels around the participants’ pillows. The results showed total sleep time was significantly longer in the intervention period than in the control period. The duration of the longest sustained sleep period was significantly longer and early morning awakening was significantly less in the intervention period compared to that in the control period.