Shoutbox

I've recently taken to hibernating my Win 7 desktop instead of leaving it on all day and I'm finding that it's starting itself up for no reason.  It definitely hibernates okay, but will randomly turn itself back on (sometimes while I'm in the room)

I don't think it's a problem with the computer as my girlfriend's laptop has done the same thing....I was just wondering if anyone had any ideas/suggestions?

Thanks!