If the family blending occurred after a traumatic event (divorce, death of a parent, relocation), night terrors and hypervigilance are common side effects. Your stepsister isn't trying to annoy you. She is trying to survive the night. When she says, "I can't rest alone," she isn't being dramatic. She is describing a physiological inability to relax her nervous system.
Before problem-solving, gently explore why she can’t rest alone: My stepsister can-t rest alone and decides to s...
"I was thinking... could I sleep in your room for a bit? Just until I feel better, I promise I won't disturb you," she asked, her eyes pleading. If the family blending occurred after a traumatic