On the bed beside the window lay Jonathan Harker, his face flushed and breathing heavily as though in a stupor. Kneeling on the near edge of the bed facing outwards was the white-clad figure of his wife. (21.42)
It's important that Mina doesn't get victimized by Dracula just anywhere – she gets bitten on her marriage bed. That's like the holy of holies of the British home.