I'm trying to find an inexpensive way to throw a fun birthday party for my son who will be 7. But I don't have alot of experience with boys this age. I was thinking of letting him have about 10 kids over for a sleepover. But do boy's "do" sleepovers? Or is that only a girl thing? I know it would be mayhem, and I'm probably crazy for even trying. And if I do this, it has to be boys only, right? Even at this age I shouldn't mix the boys and girls? What's your experience with this type of thing?