It was released on 6 September 2018 as the second single from Graace's debut extended play Self Sabotage (2018).

Graace said the song was written at a point when she realised her self-sabotaging nature: "I was in the studio with Xavier and we had both recently gotten out of toxic relationships.

"[3]The music video was directed by Sejon Im and released on 3 October 2018.

AIRIT said "'Last Night' features breathy sultry vocal anchored by anthemic piano chords and alt pop production.

The track flows between downtrodden verses and uplifting choruses, as though the narrator is coming to some sort of realisation after a long time of struggling.