to stay up late perhaps in a certain place; to make a shadow by standing in front of others (see Molina)
Alonso de Molina:
yuuilia. ni. (pret. oniyuuili.) lo mismo es que yuuaquilia.
yuuilia. nitla. (pret. onitlayuuili.) hazer sombra poniendose delante de otros. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 44v. col. 1. Thanks to Joe Campbell for providing the transcription.