It was only that small peace that he had woven for her that allowed Claire to have a solid few hours of sleep without it being broken by remembering everything.
Sleeping was, quite obviously, the least favorite of 'necessary' things to do right now, as it often lead to exacerbation of other problems, like the reason she ate so little lately. She would wake from the nightmares (night or day, if it was a deeper nap during the day taken against Dean or Peter's shoulder), have to dash to the bathroom and then lay on the tile and rugs until the images had dulled enough to attempt to go back to where she had been.
But that promise, backed by the brief respite of pushing back everything that had happened, at least took more than just the edge off her exhaustion. Those hours were peace, but eventually that peace was broken, as it so often had been lately.
The thing about the tangle of comforter while sleeping was that it came loose when she shifted, especially when she had nightmares, slipping down bit by bit, even if whoever was closest moved it back if it fell too far. Waking without that blanket wall around her was akin to feeling exposed again, as with it, there was something to wake up too, softness pressed against her skin all around. Without it, air moved over her skin, reminding her of being laid out naked with no defenses, that point when everything had been so raw that even drafts of air had caused her pain. Some might have thought her healing ability was a defense, a way to fight back, but Alastair had shown her in those long hours that it was even more of a curse than she had ever imagined it to be.
Without nightmares, it hadn't shifted much, but in deeper sleep, she had still moved, exposing cheek, neck and ear to the air beyond the comforter. The touch of it was light as she stirred from sleep, half-awake, but still half-asleep, and it was likely just Peter's breath against her cheek, rustling her hair, or a small draft from a cracked window or door, circulating in the room, but it was enough to set off that exposed panic and send her bolting upright, scrambling for the comforter until she had woken enough to know where she was and who was with her.