Wayob is the plural form of way (or uay), a Maya word with a basic meaning of 'sleep(ing)', but which in Yucatec Maya is a term specifically denoting the Mesoamerican nagual, that is, a person who can transform into an animal while asleep in order to do harm, or else the resulting animal transformation itself.[1] Already in Classic Maya belief, way animals, identifiable by a special hieroglyph, had an important role to play.