[2] Both "Sleepwalker" and "Sleepless Night" had been recorded in lengthy, seven-minute versions, eventually resulting in the tracks being cut down for their final releases.

"[2] Melody Maker's opinion of the song was mixed, stating "Kinks fans/lovers of 'Waterloo Sunset' won't find 'Sleepwalker' very satisfactory.

"[2] Cash Box said that its "classic rock guitar chords, and an infectious chorus are the pop hooks, and the execution is impeccable throughout.

"[6] More recently, Denise Sullivan claimed that, in her review of "Sleepwalker", "it's the kitchen sink of rock & roll songs.

The band lip-synched the track on an episode of The Mike Douglas Show (followed by an interview and live performance of "Celluloid Heroes") that aired on 8 February 1977.