Sometime Last Night is the second studio album by American band R5. It was released on July 10, 2015 by Hollywood Records. On April 6, the album was announced along with a summer tour to promote the new album, of which a US and European legs were announced. Five singles have been released from the album — "Smile", "Let's Not Be Alone Tonight", "All Night", "I Know You Got Away" and "Dark Side", while "F.E.E.L.G.O.O.D" was released as a promotional single. Sometime Last Night debuted at No. 6 on Billboard 200, No. 1 on Billboard Top Pop Albums, No. 3 on Billboard Top Digital Albums, and No. 4 on Billboard Top Album Sales, with 31,000 copies sold during its first week.

R5 released their debut studio album Louder in September 2013, featuring the singles "Loud", "Pass Me By", "(I Can't) Forget About You" and "One Last Dance". The band promoted the album touring North America, Europe and South America. They later released their second EP, Heart Made Up on You, which they described as a "first taste" of their second studio album. The album was set to be released in spring 2015; however, Rocky Lynch announced that it was pushed back because they wanted to "get it right" for the fans. The songs from the Heart Made Up on You EP were originally scheduled to appear on the album, but R5 scrapped them and the rest of their album in favor of starting over.

The album's production started in summer 2014, shortly after the band ended the Louder World Tour. They released the Heart Made Up on You EP, the songs on which were scheduled to appear on Sometime Last Night. However, due to further production and revisions, Ross Lynch announced in a radio interview that the band has decided these songs will not appear on the album, because they wanted a "blank slate".Rydel Lynch also confirmed in a tweet that no songs from the EP will be featured on the album. They wanted to "get it right" for the fans, and have therefore gone through the album multiple times before finalizing it.

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