The origins of "Let's Go to Bed" lie in "Temptation", one of the demos for Pornography. The song is a relatively upbeat, guitar-driven instrumental. In August 1982, soon after Simon Gallup's departure from the band, Smith demoed a vocal version of the track, entitled "Temptation Two", a psychedelic piece not far removed from the Pornography album but somewhat lighter in tone. At the end of the song, Smith sings a string of wordless syllables, nearly identical to the "doo doo doo"s of the later song. The song version was debuted on Kid Jensen's radio show on 27 November 1982, as a take which was very close to the final version that appeared as a single in the same month.
On 15 March 1983, the song was the first broadcast for the pioneering Boston, Massachusetts-based alternative rock radio station WFNX. When WFNX was sold and ceased broadcasting on 20 July 2012, "Let's Go to Bed" was selected as the station's final broadcast.
The song's music video was the band's first collaboration with Tim Pope, who would go on to direct several more videos for the group. The video features members Robert Smith and Lol Tolhurst, who at that point were the only members of the Cure - the only instance in the band's history where the band officially had a two-person lineup.