M.K.
I am have been having this issue lately. At night it seems as if my son does the standing in the crib when he is over tired. Last night I had to keep laying him back down and rubbing his back and tummy. I did this for about 30 minutes until he finally gave up and went to sleep.
As for his naps, I posted about 2 weeks ago for this also. I started putting him in his pack and play and he sleeps well. I don't know what it is about the crib and naps but he won't have it. I don't keep toys in his crib but I do in his pack and play and he does "talk" to his toys for about 20 minutes and then falls asleep.
I read something that says kids need to "unwind" they are learning so much that they need their down time too.
Hope this helps.