Well, I suspect you can do anything in a LD. I haven't had one... but it's YOUR dream... so just believe and you should be able to do it!

Since none of it's real, I assume you just have to concentrate and believe that you can... just do it...

That also explains how the clock set itself. You thought about it... it's not real... I guess... that's what heaven is like! Your mind can do anything with enough concentration and heart!