logo lights up while MBA sleeps -- ??

I've got a week-old MBA (Rev A) that I love to the very corners of its oh-so-sleek body. So far, it's been a fabulous machine, and it almost never leaves my side. Tonight for the first time, while I was working on my iMac and recharging the MBA, I noticed that the Apple logo on the top of the case lit up briefly. The MBA was closed and sleeping. The logo did this a few times, not with any particular regularity. Just to see, I turned off Airport, and the logo didn't flash on again. Don't know whether there's any connection between the two. So the question is: Is this normal? Is it static? (I live in Maine, indoor heating's starting to dry things up.) Is it anything to worry about or keep an eye on? This is a new machine, so I'm hoping to identify any problems early on. Answers welcome.