How can i keep my hair curly overnight?

I've just curled my hair with a GHD straightner and i want to keep it curly for tomorrow. is there anything i could put on my head so i can keep the curls in? My hair is quite soft so they will be really frizzy and they would have come out by the morning. Please help. :-)How can i keep my hair curly overnight?
hair spray the curls. then, roll each curl up to your scalp (kind of making them into a circle flat against your head. sorry i can't explain it better in words, just play around with it and you'll get it!), and bobby pin them to your scalp to set them for the night. hair spray it again, and maybe sleep with a shower cap on tonight if you're willing, to protect the curls from rubbing against your pillow and frizzing?How can i keep my hair curly overnight?
Don't go to bed.
One of the things that you can do is sleep siting up, if you don't want to that put one of those plastic caps on your head but, when you lay down don't move your head that much. Good luck hope yoiu find the answer if this one doesn't work.
you can try a loose braid it keeps the hair in place and then put the head scarf over your head firmly and tie it tight but not where it will hurt if it is loose the curls will fall. in the morning your hair will need a few touch ups but that wont be a problem just fluff out your curls again and go on.