To get my big kid, Mason, sleeping in a big-boy room, we got him what he totally wanted—a fish tank—and put it in his room. It gives him something to look forward to every time he goes down for a nap and to bed at night. We make a game of feeding the fishies and saying good night to them too. Without it, I don't think he would have ever left his crib. If your kid doesn't like fish, try another easy pet, like hermit crabs or lizards.
What else is on Melissa Joan Hart's mind?