What if she just ruffled up her hair to look disheveled intentionally- or unintentionally just from running her hand through her hair while thinking? Or she just went for the disheveled look before tugging him into bed to curl up with him and relax. Either way, they were both pretty biased, bit it was fine since it only effected them both. And they welcomed the attention besides. "Then that'll be a good way to spend some of our time on the train."