Alejandro released his debut studio album,
Afrodisíaco, on November 13, 2020. Two weeks after finishing the work on
Afrodisíaco, he started working on his second studio album,
Vice Versa. The latter was released for
digital download and
streaming by
Sony Music Latin and Duars Entertainment on June 25, 2021, and "Aquel Nap ZzZz" was included as the sixth track. Musically, "Aquel Nap ZzZz" is a Spanish language
trap-
bolero ballad, with elements of
R&B and
reggaeton; the song begins as an
urban song fusing trap with reggaeton, until it appears with an
acoustic guitar, becoming a bolero. The track runs for a total of 4 minutes and 55 seconds, The song includes Rosalía's vocals and was inspired by their relationship. Alejandro stated that although "not all the songs are about her specifically", this song is "literally for her". The lyrics include, "No te dejo de mirar / Eres mi niña de cristal / Te juro que yo mato por ti" (I can't stop looking at you / You are my crystal girl / I swear that I would kill for you). During an interview with
Los 40, Rosalía admitted that it is her favorite song by Alejandro. ==Critical reception==