Aromatic stimulation with essential oils shows promise in improving both CPAP adherence and sleep quality, offering a novel approach to enhance OSA treatment efficacy.
Subjective sleep quality significantly improved after 67 days of aromatherapy intervention in OSA patients with poor CPAP adherence.
CPAP usage duration significantly increased following the aromatherapy intervention.
No significant change in apnea-hypopnea index (AHI) was observed during CPAP use over the intervention period.
The study enrolled a small sample of eight OSA patients with poor CPAP adherence who were exposed to lavender or cypress aroma oil during sleep.
Aromatherapy was investigated as a noninvasive, cost-effective adjunct intervention to address poor CPAP adherence in OSA patients.
This research suggests that using aromatherapy — specifically lavender or cypress essential oils — during sleep may help people with obstructive sleep apnea (OSA) stick to their CPAP therapy more consistently. CPAP machines deliver pressurized air to keep airways open during sleep, but many patients struggle to use them regularly enough to get full benefit. In this small pilot study of eight OSA patients who were previously using their CPAP machines poorly (less than 4 hours per night on average), nightly aromatic stimulation over about two months was associated with meaningful improvements: nightly CPAP use went from about 2.5 hours to nearly 4 hours, and the percentage of nights with adequate CPAP use (over 4 hours) jumped from 5% to nearly 26%. Alongside these objective improvements in CPAP use, participants also reported feeling better rested. Both their Pittsburgh Sleep Quality Index scores (a measure of overall sleep quality) and their Epworth Sleepiness Scale scores (a measure of daytime sleepiness) improved significantly. Importantly, the CPAP machines continued to effectively control breathing events during sleep, suggesting the aromatherapy supported — rather than interfered with — the core therapeutic function of CPAP. This research suggests that aromatherapy could be a simple, low-cost add-on strategy to help OSA patients use their CPAP machines more consistently, potentially improving long-term health outcomes. However, the study was very small (only 8 participants) and lacked a control group, so the findings should be interpreted cautiously. Larger, controlled trials are needed to confirm whether these effects are due to the aromatherapy itself or other factors such as increased attention and support from participating in a study.
Ishimizu E, Inoshita A, Suzuki Y, Nakamura M, Kasai T, Matsumoto F. (2026). Effect of aromatic stimulation on CPAP adherence and sleep quality in patients with obstructive sleep apnea: a pilot study.. BMC complementary medicine and therapies. https://doi.org/10.1186/s12906-025-05243-9