Laughing and Lightening

Has anyone ever heard of a child laughing during a middle-of-the-night thunderstorm?  More than once, Reagan has awakened us in the wee hours with his clapping or singing or jibber jabber. Apparently he wakes up and keeps himself (and the rest of the house) entertained until he falls back asleep.  Well last night, during the storm, he was awake again. But this time he was cracking up. At first we thought it was because of the sounds of the storm, which was odd enough, but then we realized it was in time with the lightening. Every time the house would light up, he would laugh out loud. Maybe the silliest thing he's ever done. And he does a lot of silly things.