Sehun:
He'd probably be awake, scrolling on his phone or something, when he first saw you shift. He'd just shrug it off until you cried out. He'd wake you up, seeing your eyes tear up. He'd hold you until you stopped shaking, whispering it's okay to you until you drifted back off to sleep.
Chen:
Would be low-key upset that you wake him up until he say the tear streaks on your face. He'd then engulf you in a hug, rubbing your back as he listens to you explain your dream.
Xiumin:
He'd wake up when you screamed, probably thinking that there was a robber or something. He'd roll out of bed, peeking over the edge. You'd apologize for waking him up, saying it was just a dream. Being Xiumin, he'd do anything and everything to make you smile or laugh.
Kyungsoo:
He wakes up when he feels you sit up. He'd look at you, somewhat confused, until he sees you shaking. He'd instantly sit up, taking your hand and letting you tell him your dream. When you tell him it was about him leaving you, he'd be shocked. He didn't know he meant that much to you. He'd tell you he would never leave you, comforting you until you drifted back to sleep.
Suho:
Out of everyone, he'd be the best one to handle this. He'd be very nurturing, getting you a glass of cold water and holding you close to him until you wanted to tell him. He'd hold your hand or play with your hair as you told him.
Baekhyun:
He'd probably be halfway awake when you tried to wake him up. He'd be so confused until you actually said the word nightmare. Then, he'd be at work, covering you in kisses and wiping your tears away. He'd be a huge cuddle bug.
Chanyeol:
After waking you up from crying, he'd listen intently to your description of the dream. Afterwards, he'd promise to fight off the bad dreams if you promised to go back to sleep. He'd pull you closer than usual, wanting you to feel safe.
Kai:
Though he's not too great with words, he'd comfort you with gestures. He's pulls you close and give you soft kisses until you calmed down. He'd hold you until you fell asleep, smiling as you nuzzled into the crook of his neck.
