"Wake Me Up" is a song recorded by English-Irish girl group Girls Aloud from their second studio album, What Will the Neighbours Say? (2004). It was released by Polydor Records on 16 May 2005, as the fourth single from the album. The song had been initially considered as the lead single, however, it was deemed as sounding too harsh and the record company did not want to take the risk. The track was written by Miranda Cooper, Brian Higgins, Tim Powell, Shawn Lee, Lisa Cowling, Paul Woods and Yusra Maru'e. "Wake Me Up" is a pop rock song composed of a "garage rock guitar riff". It received mixed reviews from music critics. While some described it as predictable, others wrote that it appeared to be an attempt to recapture the sound of some of their previous release. Alex Kapranos, the lead singer of indie rock band Franz Ferdinand, said "Wake Me Up" inspired the band to work with producer Brian Higgins.

"Wake Me Up" debuted and peaked at number 4 on the UK Singles Chart, and became the band's first single to miss the top three. The song also peaked inside the top ten in Ireland, but missed the top ten in Europe. The accompanying music video was directed by Harvey & Carolyn, and portrays the band as rocker chicks as they ride motorcycles along a desert road. "Wake Me Up" has been performed on all of the group's concert tours, and also in a few live television appearances, including twice at the Top of the Pops, where Harley Davidson lent motorbikes for the members to use for the first performance, and at Today with Des and Mel. In 2005, "Wake Me Up" won the award for the Popjustice £20 Music Prize, an annual prize awarded by a panel of judges organised by music website Popjustice to the singer(s) of the best British pop single of the past year.

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