Calea zacatechichi, also known as Dream Herb, Leaf of God, and Bitter Grass, is a plant used by the indigenous Chontal of the Mexican state of Oaxaca for oneiromancy (a form of divination based on dreams.) The plant naturally occurs from southern Mexico to northern Costa Rica. It has been scientifically demonstrated that extracts of this plant increase reaction times and the frequency and/or recollection of dreams. The Chontal medicine men, who assert that this plant is capable of “clarifying the senses” causing euphoria, call it thle-pela-kano, meaning “leaf of God”. Whenever they desire to know the cause of an illness or the location of a distant or lost person, the common ritual is to smoke a cigarette, whilst drinking a tea, both made of Calea Zacatechichi, right before going to sleep.