Smiles of a Summer Night (Swedish: Sommarnattens leende) is a 1955 Swedish comedy film written and directed by Ingmar Bergman. It was shown at the 1956 Cannes Film Festival. In 2005 TIME magazine ranked it one of the 100 greatest films since 1923. The film's plot—which involves some couples who switch partners on a summer night—has been adapted many times, particularly as the theatrical musical A Little Night Music by Stephen Sondheim, Hugh Wheeler and Harold Prince, which opened on Broadway in 1973, and as Woody Allen's film A Midsummer Night's Sex Comedy (1982).