Overnight curls details in question!?

Okay so I want my hair to be curly. It's has its of curl already in it and when I go swimming it goes curly when I get it wet. I don't have curlers and I need it for my speech tomorrow so I don't have time to curl it tomorrow morning I don't hav time or the paper bags for the paper bag curls and the curls with a sock don't work for me the bun thin doesn't either HELP!