G.M.
Your son probably is overwhelmed with all his new discoveries, and learning new things that it excites him, and he can't sleep. This is what happened with my son. Does he have a full tummy before bedtime? Sometimes if they are still hungery, they don't go to sleep very good. Their schedule does change quite a bit because of them growing up and learning new things etc., and right now you'll have to may be adjust to his schedule for the time being. Or, if you can, get him up a little earlier in the morning say, by 7am and only allow one nap if he's tired enough to take one, and do calming activities in the early evening to help him settle down more. Do you have a Mommy Bear? They work wonders...They have the sound of the mother's womb and it works on our son, as well as on my husband and I! :-) I hope you find something that works for you. Best wishes, G.