For the bedtime story, toddlers the interaction is started by the adult. For children, the kids start it by asking to be read to sleep. I only saw the options if it were evening or they had the tired moodlet. And the children always went to the parents bed to be read to sleep, never to their own. Also, if they have the tired moodlet and you click on that, they will queue up ask someone to read them to sleep unless no one else in the house is awake.