By: Mark Barber Goodnight Mommy exists at the intersection between Dead Ringers and Psycho, with a little bit of Misery thrown in for good measure. Twins Lukas and Elias (named for their actors, Lukas and Elias Schwarz) settle into their country home with their mother (Susanne Wuest), who is recovering from facial surgery after a brutal car accident.  In the midst of divorce proceedings, she does not take the trauma and stress well, and begins…