An oneirogen is something that can produce or generate (-gen) a dream or a certain type of dream (oneiro-). For example, mugwort is plant that grows by water and in wastelands, and can be picked and brewed as a tea, and has a long history of being used to enhance dreaming. Other oneirogens are touted as specifically good for enhancing dream lucidity. One of these that has scientifically tested is galantamine, which has been found to be much more effect than placebo in producing lucid dreams.

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