"When you should be lying down," Meredith points out. "I know you want to move, I know you don't want to be here, but I need you to be. I need you to stay put for a little while. I need you." Maybe that's why this makes her so nervous, she realizes — because she needs him with her and so long as he's here, he is. So long as he's in this bed, she knows where he is; she doesn't have to wait at home alone, kept in the dark again.