In the past several months, Tumbles has starting carrying around his "woobie" and crying out while the toy is still in his mouth. He does it mainly at night when we've gone to bed, but I saw him doing this when he thought he was left alone in the house this morning. When I opened the bathroom door, he was coming down the hall dragging his woobie and crying out. He never plays with the toy, but I find it in different places throughout the house in the mornings. Why does he do this? Is it a comfort thing?