You can easily mix essential oils to create a unique therapeutic scent for improved sleep quality. While there is no wrong way to blend your oils, mixing oils within the same fragrance family or complementary categories is a good starting point for beginners. For example, geranium, lavender, and ylang-ylang are all floral fragrances with sleep-promoting qualities and will most likely complement one another. Also, keep in mind, you want your blend to relax you and decompress your mind, so stay away from stimulating oils as they may have the opposite effect.