There really is no better time to have sleepover party than the summer. Not only are the kids likely missing some of their school pals -- outdoor summer fun will (hopefully) poop those kids out for (their much later) bedtime! Amp up the fun by letting the kids have an after-dark dip in the pool or run through the sprinkler. Allow s'mores-eating in PJs. Maybe tonight's the night to set up the backyard movie theater or you bust out the backyard tents. Whatever you do, don't get wound up when the kids are still giggling at 11pm. After all, there's no school tomorrow.