Something funny at 2 am!?!?

Last night I was walking around with Kyson (we have had to do this alot lately. His reflux kills him when he eats then falls asleep--about an hour later he just screams). He had just fallen asleep, or was more in a semi-sleep state when he let out a true giggle and got the biggest grin. Then a few minutes later I got another big giggle. Then I got a third one that was a full blown laugh. I wish I knew what was so funny at 2 AM! I saw nothing very funny--I bet he was thinking, look at this sucker that will walk me around until I fall asleep!