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Search strategy used in PubMed database.
| Number | Search items |
| 1 | Aromatherapy |
| 2 | Aromatic therapy |
| 3 | Aroma |
| 4 | Aromatic |
| 5 | Fragrance |
| 6 | Aromatic substances |
| 7 | Essential oil |
| 8 | 1 or 2–7 |
| 9 | Sleep |
| 10 | Insomnia |
| 11 | Sleep disorder |
| 12 | Sleep quality |
| 13 | Comorbid insomnia |
| 14 | 9 or 10–13 |
| 15 | Randomized controlled trial |
| 16 | RCT |
| 17 | 15 or 16 |
| 18 | 8 and 14 and 17 |
