Sleep

LD just doesn't like sleep anymore. He prolongs bedtime as long as he can and refuses to sleep in his crib which is fine but he is waking up every day around 5:30 and is wide awake at that time. The first word out of his mouth is usually train - wanting to go downstairs to play with his train. The kid is a freak about trains. He lines up all his cars and then says train. He does the same with food. The other thing is obsesses about is "tinkle, tinkle, star" :-) He loves that rhyme and does the finger motions with it. But at 5:30 the stars are still twinkling for me. How can i get him to sleep longer???? This is about the 2nd month of it and i'm trying to be gentle with him and not make him cry in his crib etc because over the last few months he's gone through some big changes and then he's about to move into a new house which i'm sure is scary to a kid. But i really need some sleep. I haven't been able to get any work done during his nap because i'm just too exhausted to think and write. Anybody else ever have this problem? How did you fix it?