Naps

Tyson will not nap in his crib, I don't know what to do! He has a habbit of sleeping in his swing. He'll sleep in there for hours, but he'll only nap in his crib for about 15 mins. I keep trying but nothing is working! He has been having lots of fun rolling over. For the first time yesterday, he rolled from back to tummy. He had only been doing tummy to back. I looked over and he was on his tummy....I missed it! But now he wont stop doing it! Its so funny!!