to cast a spell on someone and put them to sleep, in order to steal that person's property (see Molina)
Alonso de Molina:
cochtlaza. nite. (pret. onitecochtlaz.) adormecer a alguno con encantamiento, para robarle su hazienda. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 23r. col. 2. Thanks to Joe Campbell for providing the transcription.