- Once Upon a Mattress is a musical adaptation of Hans Christian Andersen's fairy tale 'The Princess and the Pea'.
- The musical first opened off-Broadway in May 1959 before moving to Broadway later that year.
- Carol Burnett made her Broadway debut in Once Upon a Mattress, playing the role of Princess Winnifred.
- The original Broadway production received a Tony Award nomination for Best Musical and a Best Leading Actress nomination for Carol Burnett.
- Once Upon a Mattress is a popular choice for performances in high school drama programs and community theater groups.
- Once Upon a Mattress has been adapted for television three times, with Carol Burnett starring in two of those adaptations.
- A notable revival in 1996 starred Sarah Jessica Parker as Princess Winnifred and featured a cast that included Jane Krakowski and David Hibbard.
- The 2005 television adaptation featured not only Carol Burnett but also Tracey Ullman as Princess Winnifred and Matthew Morrison as Sir Harry.
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