Desvelo translates to "sleeplessness" or "wakefulness". It's a more evocative and less common word than simply saying "no dormir" (not sleeping).
In the song, Eladio Carrion sings, "Son más de tres mil noches de desvelo" (It's more than three thousand nights of sleeplessness). This word powerfully conveys the long, agonizing nights spent awake, likely due to heartbreak or worry, making it a poignant and memorable choice.
Eladio Carrión teams up with Lia Kali for a reggaeton breakup song built on one blunt confession: "Me muero" ("I'm dying"). Lia Kali opens in English, asking "Say you miss me when you're sorry, tell me, baby, are you even sorry?" before Eladio takes over in Spanish, tallying what's left after the split — "No hay Dios ni casa que me ampare" ("There's no God or house to shelter me") and "No hay song que cuente todos mis males" ("There's no song that can tell all my troubles"). He piles boasts on top of the hurt in the same breath, comparing his broken heart to Bowser and Luffy while still admitting "Me tuve que despedir" ("I had to say goodbye").