Spray it down with some good ol' hairspray & head on out.
I wore my hair like this for the 4th of July this past year!
Now when you wake up.
Take off the head-band and shake your hair. Brush through with your fingers.
Might need to touch up some curls with a curling iron..
But if you are like me...& you just don't care?
I love the Blake Lively look anyway!