[A] Written and produced by Play & Win members Sebastian Barac, Radu Bolfea and Marcel Botezan, the song was released in October 2010 as the first single from I Am the Club Rocker.

To promote "Sun Is Up", an accompanying music video was shot by Alex Herron in late August 2010 in Marbella, Spain, and uploaded onto Inna's YouTube channel on 30 September 2010.

In June 2010, Inna announced via her official website that two new songs, "Un Momento", a collaboration with Spanish singer Juan Magán, and "Sun Is Up", would be featured on an upcoming "Summer Hit Pack".

[11] A "Euro rave pop" song,[4] "Sun Is Up" was written and produced by Romanian trio Play & Win members Sebastian Barac, Radu Bolfea and Marcel Botezan.

"[14][15] Paul Lester, writing for The Guardian, noticed similarities to Sabrina's "Boys (Summertime Love)" (1987),[4] while French website Musique Radio praised its rhythm and melody.

[5] Fans of "Sun Is Up" include British group One Direction, who released a video of them on social media in January 2012 dancing and singing along to the track in their car while on their Up All Night Tour (2011–2012).

An editor of Capital FM positively regarded the video, while resuming its plot: "While Louis and Zayn show off their best moves, Harry then turns the camera onto Liam Payne, who is doing some head bopping.

She was ranked in third place by the online voting, but she won following the decision of a jury panel consisting of various journalists, music producers, disc jockeys and radio stations.

[42][43] She also performed the song at the 2011 Romanian Music Awards in Brașov on 16 September,[44] and at French event Starfloor on 26 November at the Palais Omnisports de Paris-Bercy in Paris.