1.VerbTo go to bed; to go to sleep (especially at, or around midnight).
"I'm about ready to turn into a pumpkin. You can stay up later if you want.; Tell her I'm turning into a pumpkin if she stays out too late. She won't be getting a lift from me."
2.VerbUsed to indicate a curfew, or the time by which one must depart.
"My daughter turns into a pumpkin at 10:00, so you need to have her home before then.; I'm turning into a pumpkin at 4:00, so we need to finish this.; "I need to get back now!" "Why? Are you going to turn into a pumpkin?""