Santa Claus, the Tooth Fairy, the Easter Bunny, the Sandman ... these mythical characters sprinkle our childhood memories and fill us with nostalgia. As parents, most of us weave these fantasies into tales which enrich and enhance our own little one's childhood experience. Children look eagerly forward to the magical appearance of gifts under a tree, money under a pillow, even tales of the Sandman serve their purpose in gently transitioning a child from the excitement of a day filled with activity to a restful sleep. These mythical characters add magic and excitement to our children's lives and ultimately aid in the development of our children's imagination. At some point, however, most children are ready to give up their belief in Santa or the Tooth Fairy and to hear the "truth": that these are really myths, and Mom or Dad has been playing the leading role in this fantasy play. But how do we know when that time comes?