midnight; home time; bed time.
Reference: when the clock strikes midnight, cinderella's carriage turns into a pumpkin, so she must leave the ball and head home to sleep.
Goodness it's late, it's WAY past pumpkin time!
Time to go to sleep, bedtime.
It was past bedtime for my child, and when I found him asleep on the floor with his toys I softly said, "Pumpkin time!" just like my mother used to with me.