Need help with Imagine Teacher School Trip

Hi there.I know this is quite an easy game, but I just need help on the part where you have to calm the kids down in the dorms so they go to sleep, if one of the kids is asking for something (ie: they have a speech bubble with an object inside), what do you need to do to get the item, I can never see an option to go back?

you blow into the ds which should make them sleep.turn the light off.then the bubbles over there head means that they want that thing in it, look around that room or one of the others and you should find it. i hope it helped