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Excessive yawning
Excessive yawning can be described as a physical effect which induces repeated and spontaneous yawning despite a complete absense of sedation or sleepiness. The experience of this effect most commonly occurs on hallucinatory tryptamines such as psilocin, psilocybin, psilacetin, 4-HO-MET and others.
Psychoactive substances
Compounds within our psychoactive substance index which may cause this effect include: