Who stole all the toys?

After a good half hour of "Mummy cuddle", "baby gone", "bag off", "hello knee", "Mia naughty", "Hannah good girl", "Garden!" chatter from the girls they finally nodded off, so I ventured up there a bit later to try and restore some vague order to the nursery. Hannah was asleep in her empty cot with one leg out of her grobag and Mia was out of her grobag and surrounded by toys - hers and Hannah's!!