The study’s results indicate that the use of aromatherapy reduces patients’ subjective perception of nausea and IV antiemetic use in the PACU by nearly 50%.  Anderson L, Gross J.  Aromatherapy with Peppermint, Isopropyl Alcohol, or Placebo is Equally Effective in Relieving Postoperative Nausea.  Journal of PeriAnesthesia Nursing, Vol. 39, No. 1, Feb., 2004: 29-35.

Unlike scented oils, the Sweet Dreams and Fresh Scent face masks do not interfere with infrared anesthetic drug monitoring.  Hinkle A.  Patient Safety and Scented Pediatric Anesthesia Facemasks.  J. Clin. Anesth., Letter to the Editor, vol. 9, September 1997.