Seriously, What do my children have againts Sleep?

I don't know what is going on with James lately, but he has something against going to sleep. He has been a good sleeper until recently. He gets out of bed opens the door. He fights getting into his big boy bed. Which he used to love and giggle when we would lay him down. He has not been falling asleep for his naps on the first try anymore. Today he didn't even nap. I am going crazy with this new habit. Hannah, she is all over the place with her sleep. Some nights she is getting up every two hours, some nights its only once. At least with her she doesn't have a full set of teeth so we can blame the teeth and growing spurts.