An oneirogen, from the Greek ὄνειρος óneiros meaning "dream" and gen "to create", is a substance or other stimulus which produces or enhances dreamlike states of consciousness. This is characterized by an immersive dream state similar to REM sleep, which can range from realistic to alien or abstract. Many dream-enhancing plants such as dream herb (Calea zacatechichi) and African dream herb (Entada rheedii), as well as the hallucinogenic diviner's sage (Salvia divinorum), have been used for thousands of years in a form of divination through dreams, called oneiromancy, in which practitioners seek to receive psychic or prophetic information during dream states. The term oneirogen commonly describes a wide array of psychoactive plants and chemicals ranging from normal dream enhancers to intense dissociative or deliriant drugs. Effects experienced with the use of oneirogens may include microsleep, hypnagogia, fugue states, rapid eye movement sleep (REM), hypnic jerks, lucid dreams, and out-of-body experiences. Some oneirogenic substances are said to have little to no effect on waking consciousness, and will not exhibit their effects until the user falls into a natural sleep state. List of oneirogens Calea zacatechichi has been traditionally used in Central America as a believed way to potentiate lucid dreams and perform dream divination. It can promote dreams vivid to the senses, sight, scent, hearing, touch, and taste. May be taken as a tea or smoked. Entada rheedii ("African dream bean") Mugwort, see Artemisia douglasiana List of possible oneirogens Amanita muscaria (contains muscimol) Amphetamines and other stimulants can create psychotic episodes (called stimulant psychosis) which may be defined as bursts of dream activity erupting spontaneously into waking states; this is not due to the substance itself but rather a result of the prolonged suppression of cholinergic activity and REM sleep due to amphetamine or stimulant abuse. Artemisia douglasiana or California mugwort, Douglas's sagewort or dream plant, is a western North American species of aromatic herb in the sunflower family that can be used as a scent, tea, or smoke to trigger vivid and lucid dreams. Artemisia vulgaris Wild red asparagus root may promote dreams that involve flying. Atropa belladonna (contains atropine, hyoscyamine, and scopolamine) Atropine (via blockade of acetylcholine receptors) Benzatropine Datura (contains atropine, hyoscyamine, and scopolamine) Dextromethorphan (the main ingredient in many cough syrups) Dimethyltryptamine can trigger intensely vivid and surreal spiritually charged dream states. Diphenhydramine ("Benadryl") can invoke an intense hypnagogic REM-like microsleep often indifferentiable from reality. It accomplishes