Somnambule translates to "sleepwalker." It's an evocative and somewhat uncommon word in everyday French, making it stand out in the lyrics.
In the song, it's used to describe the protagonist's state: "Somnambule dans la nuit" (Sleepwalker in the night). This metaphor paints a picture of someone moving through life aimlessly or unconsciously, perhaps lost in thought or emotion, which perfectly captures the song's theme of a young woman searching for happiness and identity.
Marwa Loud opens "Pas Là" on the title's own image: "Elle s'est laissée tomber dans le vide" [She let herself fall into the void]. Everyone else just watches and picks it apart — "Laissez les gens l'analyser" [Let people analyze her] — while she names the one person who should have caught her but didn't: "Mais son papa n'était pas pas là" [But her dad wasn't there]. A few lines later the same absence shows up again, aimed at herself instead of her father: "Son bonheur n'était pas là non" [Her happiness wasn't there, no].
The second verse turns that idea toward fame. She's the girl "Toute la France l'a validée" [The whole of France validated her] — right up until "Pour ensuite la négliger" [Then neglected her]. Her career keeps moving anyway, "De Paris à Constantine" [From Paris to Constantine], tracing a line back to her own family's roots in Algeria while the crowd that dropped her stays behind. Every chorus circles back to the same two-line ask, not as a plea but as a plain bill for what all that attention cost her: "Rendez-lui son cœur" [Give her back her heart], "Effacez-lui ses peurs" [Erase her fears].