I have four year old twins that have shared a cot and then a room all their lives. It has always worked well and they have never disturbed each other and seem to really enjoy sharing. But lately I have found my youngest twin hiding in different parts of the house saying that he wants to be alone. Is this his way of telling us that he needs a room of his own now. We don't have the space but could convert our other room if we really needed to. What do you think? Should twins stay together or should they have their own space?