Sleep was friendly with theatre critic Jack Tinker; the two men were often mistaken for each other. At the premiere of a production of "The Comedy of Errors", a play which depends on sets of identical twins being confused for one another, Tinker brought an identically dressed Sleep as his companion. At Tinker's memorial celebration, a pastiche of Stephen Sondheim's musical "" was staged entitled "Tinker Jack, the Demon Critic of Fleet Street" in which Sleep played Tinker, serially executing several major West End producers (who played themselves) for inflicting particular dramatic atrocities upon the city's theatre goers.