Voila! Let your hair down!
Because you are not really looking to save curls per se with this style, keeping it overnight is as easy as tying your loose hair into a low pony and covering it with a satin scarf (or sleep on a satin pillowcase* without the scarf) overnight. Remove the flower clip at bed time and reattach it in the morning.
I have done this style with 3 or 4 braids on either side of my head and it looks even better with more braids!