"Good Night" was written by Hayley Warner with Anthony Egizii and David Musumeci of the songwriting and production duo DNA Songs, who also produced the track. On 22 November 2011, "Good Night" was released for digital download and sent to Australian radio, shortly after Mastin won the third series of the The X Factor (Australia). When speaking of the song, Mastin explained: "It's got that old' summery-rock kinda feel to it you know, like classic rock songs like 'Boys Of Summer' (Don Henley). It's just really fun, and songs from [X Factor] winners are usually really big ballads, so it was cool to do something a little bit different."
Reviewers of The Hot Hits Live from LA wrote that they had "fallen in love with the track" and that the song was a "guaranteed hit that might just be our summer 2012 party anthem." A reviewer of Take 40 Australia wrote that it is "reminiscent of some of Pink's earlier tunes ... We think this will definitely be a hot summer hit!." Reviewers of MusicFix noted the song's similarities to Pink's "Raise Your Glass", and wrote that "we were pretty disappointed to hear his [Mastin's] epic rock vocals restrained to a shouty party track." This was echoed by Tonges of Nova FM, who wrote it was "shockingly similar to Pink's 'Raise Your Glass'". Lauren Katulka of Sounds of Oz wrote that the verses in the song "felt like virtual carbon copies of Pink's 'Raise Your Glass'", and concluded by writing that "it didn't feel like Reece, which is really disappointing when the [winner's] singles are supposed to be tailored to the artists." Robert Copsey of Digital Spy UK wrote that "While the riff has more than a passing resemblance to Pink's 'Raise Your Glass', we can see why he went overseas to find fame when their winner's singles are of this calibre." "Good Night" was nominated for 'Single of 2011' at the 2011 IT List Awards.
"Good Night" debuted at number one on the ARIA Singles Chart on 28 November 2011, where it remained for four non-consecutive weeks. It sold over 30,000 copies in 24-hours following its release on 22 November, and became Sony Music Australia's fastest selling digital single. On 24 November 2011, the song sold an average of one copy every 2.7 seconds. "Good Night" was certified four times platinum by the Australian Recording Industry Association (ARIA), denoting shipments of 280,000 copies. In New Zealand, the song debuted at number two on 20 February 2012, and peaked at number one the following week. "Good Night" was certified platinum by the Recording Industry Association of New Zealand (RIANZ), denoting sales of 15,000 copies.
The accompanying music video for "Good Night" was filmed on 30 November 2011 in The Lair at The Metro Theatre in Sydney. 200 fans (aged 16 and over) were recruited for the video and had to download the Performer Agreement sheet via Mastin's official website before being eligible to be in the video. A behind the scenes video by The Daily Telegraph was released on 1 December 2011, and showed Mastin on the set of the video shoot performing on stage with a band. The video premiered online on 7 December 2011. The video begins with Mastin backstage with his band preparing for a concert. As the song starts to play, Mastin is seen playing the guitar and kicking a soccer ball. He is then seen on the stage performing, whilst also showing scenes of the audience singing and dancing. The video then shows Mastin outside greeting fans, and scenes of him backstage at the concert playing with an arcade game machine. The video ends with Mastin's fans screaming, as he leaves the stage.
Mastin performed "Good Night" live for the first time on The X Factor (Australia) Grand Final show on 21 November 2011. He performed the song again on the Grand Final decider show the following day, after he was announced the winner. On 9 December 2011, Mastin performed "Good Night" on Sunrise to launch his debut album. He later performed the song during his first headlining Australian tour in January 2012.