Adam suffers insomnia. That's when he writes most of his music. I think the song was probably written out of that experience, the frustration of being so tired but not being able to sleep. You lay there and there's a thousand things to distract you. You can't always look at a video to find the meaning behind the song. Usually it's not even relevant to the song. In this case I think the toys are more symbolising distractions to sleep, rather than his yearning for childhood, notice most of the toys are electronic and are moving of their own accord.