What happened?

I want to know who came into my house during the night and traded my kids for their evil twins! Out of nowhere both my children have decided that they dont want to sleep. E fights going to bed every single night, no matter what we try. She used to go to bed so well, but not anymore. It is an all out power struggle! Guess this is part of the "terrible twos". Then our good girl, O, has decided that she is going to get up at least once, if not twice a night to eat which she hasnt done since birth. But for some reason this past month or so, she has thought it is fun. Mommy is stressed at work and so far beyond exhausted it isnt funny. I want my sweet & sleepy girls back!