Nicole Kidman as Christine

Colin Firth as Ben

Mark Strong as Dr. Nasch

Ben Crompton as Warehouse Caretaker

Anne-Marie Duff as Claire

Adam Levy as Ben

Gabriel Strong as Boy on Bike

Flynn MacArthur as Boy in Dream

Dean-Charles Chapman as Adam

Jing Lusi as Nurse Kate (uncredited)

Rosie MacPherson as Emily (uncredited)

Steve Munroe as Warehouse Worker (uncredited)

Kevin Hudson as Man on Bike (uncredited)

Samantha Kelly as Nurse with Austrian Accent (uncredited)

Nick Turner as Claire's Friend (uncredited)

Llewella Gideon as Psychiatric Nurse (uncredited)