"Sleepwalking" is a song by the British rock band Bring Me the Horizon. Written by the band's vocalist Oliver Sykes, the guitarist Lee Malia and the keyboardist Jordan Fish, it was produced by Terry Date and appeared on the band's fourth studio album Sempiternal, released in 2013. The song was released as the second single from the album on 1 March 2013, reaching number three on the UK Rock & Metal Singles Chart.

"Sleepwalking" has been noted by many commentators for its notably more mellow tone compared to Bring Me the Horizon's previous material previous. Spencer Kaufman of Loudwire, for example, noted that the song "showcases [the band's] more melodic side", praising the "beautiful bridge in the middle of the track". Similarly, the ticket merchant AXS claimed that the song "showcased that [Bring Me the Horizon] could write more poppy songs that still maintained the aggressive style they have been known for", while Mike Hohnen of Music Feeds explained that the track "[hones] in on a far more mellow, ambient vibe". Speaking in a track-by-track overview of Sempiternal with Metal Hammer, the vocalist Oliver Sykes described "Sleepwalking" as "one of the more commercial songs on the record" and "one of [the band's] best-written songs".

According to Loudwire's Sarai C., "Sleepwalking" begins "with an electronic melody which evolves into a powerful minor chord progression, paired with Sykes' perfectly executed vocals", and also features some nu metal influence. Hohnen of Music Feeds noted that the track features a "dominant role" for keyboards, accompanied by irregular drum patterns. Gregory Adams of Exclaim! proposed that the style of the song "heads towards an electronics-assisted, Linkin Park-ish melancholia". Bram Teitelman of Metal Insider also compared the song's style to that of Linkin Park, criticising its lack of "heaviness" to some extent.

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