The album is part of the vaporwave genre and features samples of Japanese television commercials from the 1980s, particularly those advertising airlines and holiday destinations.[3] The album was produced between February to March of 2013 and it was first envisioned as a sequel to Prism Genesis[4] under the title "Transcontinent".[5] The album can be streamed on her Bandcamp.[6] In 2018, Sleepline was re-released on CD and vinyl.[7]