"Up All Night" is the debut single by English singer Alex Clare, released in December 2010.

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 has been used as the opening theme for the BBC science fiction show Class which is an official spin-off from Doctor Who.

[1] The video starts with three different people, two men and a girl, who wake up lying on the ground, after having passed out 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.