CJ (4 mo) did something I thought was very strange today. I was putting him down for a nap, so I nursed him a little and he drifted off to sleep. I got up when he let go, and he startled a bit from the movement. He looked at me, looking fully awake, and I was thinking I guess I had to try again. His face lit up, he began kicking his legs and waving his arms and he was laughing for about 15 seconds. I just stared because I was in shock. He then turned his head to the other side, closed his eyes, and went to sleep. I watched him for about another 5 minutes, I just didn't know what to make of it. He's been laughing/grinning/sighing himself to sleep for a while, but he's never done that before. Anyone else's baby do anything similar or anything strange at all while trying to fall asleep?