"Up All Night" is a song by British singer Alex Clare. It is the lead single from his debut studio album The Lateness of the Hour and his first single. The song was written by Alex Clare and producers Diplo and Switch of Major Lazer and features addition production from Mike Spencer and co-writer Ariel Rechtshaid. It was first released on 9 December 2010 as a digital download in the United Kingdom. Remixes were later release digitally and physically on various vinyl formats. It has been used as the opening theme for the BBC science fiction show Class which is an official spin-off from Doctor Who.

The music video was first published through Alex Clare's YouTube channel on 10 November 2010. It is around three minutes in length and it was directed by Blake Claridge.

The video starts with three different people, two men and a girl, who wake up from laying on the ground having passing out after the previous night. Throughout the video, the girl is seen near a swimming pool, one of the men is seen running on a treadmill and the other is seen playing the drums to the song. The video progresses to show how the three characters' actions led them to the beginning of the video.

...
Wikipedia