Hello @jada1 ! I love Mugwort and I have several large Mugwort plants growing in my yard. It can be wonderful to dry and place underneath your pillow at night. I personally think this is an excellent use for it, as you’re not ingesting it. I wholeheartedly agree with @Francisco 's answer as well about being careful when using this herb. Another use you may want to try is by creating a flying potion with it - this is a type of salve that you can rub on pulse points to imbue the magickal effects without ingestion. I have also burned it to help with ancestor work and helping a dying pet move on. It has properties that help reach beyond the veil, which makes it perfect for mediumship and divination. It doesn’t smell very good though, in my opinion!
When it comes to using it, I personally believe that every ingredient needs to be cleansed, charged and consecrated before being used for magickal purposes. This ‘instructs’ the ingredient how to behave in the spell or ritual and helps to heighten and enhance the energies you are working with. Intention is important and is the backbone of this charging process. There is an article that explains all about the cleansing, charging and consecrating process at Cleansing and Charging Spiritual Tools which explains a few methods on it. I feel like Mugwort can be used on its own, but it might be enhanced with other ingredients in a spell. I love the dream pillow and sachet ideas! You could add Amethyst, Clear Quartz, or Labradorite depending on your goals and intention for the spell. It is a really amazing herb to use in magick, especially for hedge riding, astral projection, mediumship and divination.