Opening the band’s second single, “Sleep” is about waking up next to someone who doesn’t want you to leave. Drenched in muffled, delayed guitars, the song evokes a dreamlike, sleepy feeling. It’s the first song in the band’s discography to mention sleeping, a common topic which would reappear on songs like “Sleep Drifter,” “I’m Sleepin’ In” and “Sleepwalker.”

First posted on November 25th, 2010, the single for “Sleep” was released as a CD sometime that same year with a fold-out sleeve depicting King Gizzard and a Lizard Wizard. While it was added to the ASCAP ACE Repertory sometime before the release of Float Along — Fill Your Lungs, the band refused to release it. In a 2015 Reddit AMA, Stu explained that the CDs were made for friends and that he was unsure what happened to them. He also said that, at the time, he had no intentions on re-releasing the singles. In a 2020 Reddit AMA the band were asked multiple times to release the early material as part of a compilation. On December 14th, they tweeted that they were looking for high quality FLACs of the first two singles. This would be for Teenage Gizzard, released on Christmas Day. The compilation contains “Sleep” as the third song.

No performances of “Sleep” are known to exist.