What Does It Mean?

What does it mean that my second child holds whatever possession is sweetest to him in his arms at night, scared to let it go? Depending on the day he sleeps with favorite teddy bears, a cookie from a party, a stick he found in the park, a pile of books from the library, two light sabres, a twinkling, flashing wand, a cauldron of Halloween Candy, a car or a train. And he remembers. When he wakes up in the morning, if he is not clutching the beloved object he comes running into our room crying for help. So we search the sheets, the comforter and under the bed for his treasure of the day. Is it because he feels like in this crazy household nothing is his unless he is holding onto it and guarding it in his sleep?