turn into a pumpkin

turn into a pumpkin

To have to return home or go to bed due to the late hour of the night. (Usually used as a present participle, the phrase is a reference to the story of Cinderella, whose magic carriage turned into a pumpkin at midnight.) I've had a wonderful time, but I'm turning into a pumpkin. I think I'll call a cab and head home.
See also: pumpkin, turn