I have solution for the situations when for example you have a party next day but there is no time to curl your hair in the morning or that you are in a travel and forget your hair iron home...
Just use a little bit paper towel to wrap your hair before sleeping, and when you wake up and open those your hair will be curly like this.
Let's start with paper towel, I've cut one towel in to two pieces and make those as many as my hair needs..
Just wrap part of your hair with the paper towel pieces and then tie the paper so that it will keep close.
You can make smaller or bigger curls by your own preferences easily.