Smell has a powerful ability to evoke memories. Now, research from Israel suggests smell can also boost the brain’s ability to retain its memories. Familiar scents have an incredible ability to evoke memories from the past.
https://www.medicalnewstoday.com/articles/smell-helps-the-brain-form-memories-during-sleep
https://www.medicalnewstoday.com/articles/smell-helps-the-brain-form-memories-during-sleep