"It is time you were in bed," said Grace, turning up the lamp, and beginning to unbraid her hair.
This is a remnant of ancient Russian usage, when the greatest outrage that could be committed on a woman was to unbraid her hair.
Judith was sitting before her dressing-table, and had already begun to unbraid her long, rich hair.
He liked to braid and unbraid it, to lay his face against it, to plunge his hands through the coolness into the warmth of it.
Then he sat up and began deliberately to unbraid her hair, while she submitted laughing.