Delta Sleep is a British math rock band, formed in 2010 in Canterbury, Kent. They are currently based in Brighton and consist of Devin Yüceil on guitar and vocals, Glen Hodgson on guitar, Dave Jackson on bass and Blake Mostyn on drums. They have so far released 4 EPs and 4 albums. Delta Sleep emerged from a band called Sávlön, featuring bass player Maria Sullivan and drummer Adam Brogan beside Yüceil and Hodgson. They released a self-titled EP in 2010, followed by Management in 2013. Shortly after the release of Management, Sullivan and Brogan left the band to start a family and focus on other musical projects, respectively. They were replaced by Dave Jackson and Blake Mostyn, both friends of the band. Delta Sleep released their first full-length album Twin Galaxies in January 2015. Delta Sleep's musical style has been described as math rock and indie rock. Many songs feature odd time signatures and are structured unconventionally.