"Sweet Dreams" is a song by American singer Beyoncé from her third studio album I Am... Sasha Fierce (2008). Originally titled "Beautiful Nightmare", it leaked online in March 2008. The song was written and produced by Beyoncé, James Scheffer, Wayne Wilkins, and Rico Love. Columbia Records released "Sweet Dreams", the album's sixth single, to mainstream radio and rhythmic contemporary radio playlists in the United States on June 2, 2009, and elsewhere on July 13. It is an electropop song whose instrumentation includes synthesizers, a keyboard, and snare drums. Knowles employs slinky vocals to sing the haunting lyrics, which describe a romantic relationship that the female protagonist believes could be a dream.

"Sweet Dreams" was critically acclaimed by contemporary music critics, who praised its beats, synthpop sound and Knowles' vocals. Some critics noted that the sliding bassline gave the song a dark quality and resembles the one used in some of Michael Jackson's songs on Thriller (1982). "Sweet Dreams" gained popularity for its electro music style, which contrasts Knowles' earlier R&B, urban, and funk-tinged releases. The song was nominated for the Viewers Choice Award at the 2010 BET Awards. It topped the New Zealand Singles Chart, peaked at number ten on the US Billboard Hot 100 chart, and reached the top five on singles charts in Australia, the Czech Republic, Ireland, Slovakia, and the United Kingdom among others. "Sweet Dreams" was certified platinum in Australia, New Zealand and the US.

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