Released on My Bloody Valentine's landmark 1981 album Loveless, 'When You Sleep' stands as a defining track of the shoegaze genre. The song exemplifies the band's signature sound, characterized by layered guitar textures, reverb-drenched vocals, and a hypnotic rhythm section that creates an immersive sonic landscape. As a centerpiece of the album, it captures the emotional intensity and atmospheric depth that became the group's hallmark during the early 1990s. The recording showcases the band's ability to blend melodic sensibility with dense production, influencing countless artists who followed in their wake. It remains a pivotal work in the evolution of alternative rock and dream pop, celebrated for its ability to evoke profound feelings of intimacy and vulnerability through its musical arrangement alone.