one who does not sleep, who stays up late (see Molina)
IPAspelling:
toːsoɑːni
Alonso de Molina:
tozoani. velador. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 148v. col. 1. Thanks to Joe Campbell for providing the transcription.