"Shh. Don't worry about all that. Just sleep without those nightmares. I'm sure Remus will be fine. I'll check up on him after a little while." The promise was easy enough, one she could keep. Everyone had their demons. And she didn't doubt Remus had his own. But for one night, while the Werewolf had a reprieve from his change, John had one from the haunting images cooked up from is own mind, hopefully.
If there was one thing she was good at it was settling a loud mind. And she continued to stroke him, and pet him and do her best to ease his soul. So sleep would find him swift, and it would be a dreamless one. And would remain there for at least an hour or two before easing from beneath him.
The things Maryanne would have done to make waking up alone easier, would been a simple note on the pillow beside him, a "You're welcome in my home any time you need an escape." She would have been thoughtful and swapped out the place she would have been in with a couple of pillows. And he would have been tucked in.