Otis Sleep On was written and recorded by Arthur Conley in 1968. It was released as the B-side to Ob-La-Di, Ob-La-Da in 1968. The single reached number fifty-one on the Billboard chart. The single was not released in the UK. Let It Be director Michael Lindsay-Hogg owned a copy of the single. Both sides were played during the Let It Be sessions in 1969 and Paul McCartney and Ringo Starr sang along.