There are several rumors, and no one really knows which is accurate. There are two likely reasons:
1) As previously mentioned, Walt's speech.
2) If any of you are familiar with the film Sleeping Beauty, the 3 good fairies literally put the rest of the castle to sleep, "until Rose awakens." They even put the candles to sleep-so, of course, they put the clock to sleep as well. Just a cute refe More...
Never I cant stand Marvel I wish Disney would keep them seperate. I posted it in the hub so no harm just showing the latest poster. They also started their viral advertisment already like previous years.