Here are links tostudies I found:
https://healthyfocus.org/proven-essential-oils-for-snoring/ Proven essential oils for snoring.
https://www.snorenation.com/best-essential-oils-snoring/ Best essential oils for snoring.
https://www.ncbi.nlm.nih.gov/pubmed/15478208 The use of essential oils to treat snoring. Abstract: Snoring is a very common social inconvenience. This double-blind study suggests a significant reduction in snoring reported by bed partners in a group of snoring volunteers using either an essential oil spray or gargle formulation. Possible modes of action of the essential oils are discussed.