Released as the lead single of her debut album Beverley Craven in 1990, the song initially failed to chart. However, appearances in British TV and a successful UK tour prompted a re-release of the single, entering the charts in April 1991 and eventually peaking at number three in May. Its success helped her debut album also go to number three in the UK. The song also became successful when released around Europe.

Both songs written by Beverley Craven.

The song has been covered numerous times, most notably it was reworked as a dance song by group Lazard, who re-titled the song "4 O'Clock (In the Morning)". Other cover versions are by Jodie Brooke Wilson, Hind, Lutricia McNeal, Sandy Lam, Tabea or, more recently, Spanish artist Rosa López released a Spanish version (titled "Júrame") in 2008; a more faithful Spanish version was named "Entre tú y yo" and was performed by the Mexican actress Chantal Andere in 1992 for her second album and as the main title song of the telenovela "Triángulo". Another notable covers are by Hong Kong Cantopop diva Sandy Lam named "Without You, but Still Love You", and Taiwanese Mandopop diva Winnie Hsin named "Selfish", sometimes the Mandarin version and English version would be crossed over for singing competitions, as exemplified by English-Taiwanese singer (now newscaster) Annie Lin ()

In 2003, Faroese singer Guðrun Sólja Jacobsen's performance of this song won her the Danish Talent show Stjerne for en aften. Subsequently, this performance spent a record-breaking 16 weeks at number 1 on Kringvarp Føroya's now defunct chart.

In 2007, Lea Salonga recorded the song for her album Inspired, a compilation of her own favorites.

In June 2012 Technoboy and Tuneboy sampled the song on their hardstyle single "Promise Me". Three months later, German techno band Scooter sampled "Promise Me" on their single "4 AM".

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