I think Shownu would just get up and lead you back to bed. He would also wrap his strong arms around you to make sure you can’t run away anymore.
I bet he would be confused at first by seeing you standing somewhere in the middle of the night… With your eyes closed. Just like Shownu he would pick you up and carry you to bed.
Ah, this cutie. Jooheon would be scared. Seeing you standing beside him totally creeps him out. I imagine him not knowing what to do. After a while Joo would slowly lead you back to rest next to him, trying his best not to wake you up.
He would be a bit lazy to get up from the bed to get you. But after a while he finally convinced his mind. Just like other members, I.M, too wants the best for you.
I can imagine him getting a little annoyed. It would be the third time of you going somewhere without you even knowing and all he wanted was hugs and some sleep. With you by his side of course.
Same like Jooheon, Minhyuk is scared by your strange actions, after a minute you would be back by his side. He would wait to make sure you are really asleep before falling asleep himself.
This man. He would do anything just to get you to bed. Hyungwon always wanted you to be healthy and get some good night sleep. After getting you back next to him he would kiss your forehead and hug you tightly.