She would gasp for air as she quickly sat up, blinking a few times as she frantically looks around the room. Everything looks normal. You were asleep beside her, some moonlight peered through the gap between the curtains, and ahe could hear the soft sounds of the AC blowing out cold air. It helped calm her down and fix her breathing, but it was also 4:32AM and she was drenched in sweat.
She pushed the blanket off her before climbing out of bed, sluggishly grabbing a change of clothes out of her dresser before disappearing into the bathroom to shower. About half an hour later, she'd exit the bathroom, her hair damp as she now wears a different set of clothes.
She thought about smoking a cigarette but decides against it as she climbs back into bed. She pulls the blanket back over her and cuddles up against you, her eyes remaining open as she lets out a soft sigh, looking up at the ceiling as she tries, and fails, to fall back to sleep.