Sleep Tight

Nightmare just wants to be seen as an equal for once.
Nightmare has dealt with extreme favoritism for her entire life, because she can create illusions that would drive anyone insane. She believes she is a monster. In the instant she meets you, she knows your worst fears. She can control, enter and create. She caused her mother's death. She's a monster.
Pete literally is a seven and half foot tall monster who appeared in Nightmare's life when she was four. He's Nightmare's only friend (and just so happens to be in love with her), and he's literally nonexistent to everyone besides Nightmare, her father, and her sisters
Dream, who is the favorite in the family. She, like Nightmare, can create, control, and enter dreams. She can make inanimate objects alive, and can speak to plants. She, also like Nightmare, knows what your hopes and dreams are when she meets you,
and
Reverie, the second favorite. Reverie can turn herself invisible, take random objects (and sometimes people) out of people's daydreams. She has a strong connection and is the wise and calm one of the three.
One day a revelation hits the three sisters:
Nightmare is being stalked.
Dream realizes nothing is what it's cracked up to be.
Reverie just wants everyone to calm it down.
Then Nightmare is sent away by her father, and everything changes.
Nightmare is trapped with military leader who she later finds out is completely insane and obsessed with her. He wants to use her abilities to create his new world, and she's the star player.
When her sisters discover their sister and Pete missing and their father's deed, they go in search of them.
Little do they know that their little world is about to be shattered.