Just looking for ideas…
Best sleepover ever 
CF,
That’s horrible but I laughed my ass off.
As for as the OP:
Not wetting the bed?
Goodnights mean good mornings.
CF,
Have mercy on us. Please.
PG,
Illicit alcohol drinking, bad TV, pillowfights (good at any age to be honest) and too much chocolate. And maybe some hairgel to play with.
Really really sour candies.
I was extremely fond of building couch-cushion forts and networking tunnel systems throughout the living room.
Porn too. If one of our dad’s had any porn, the mission for the night was to find it.
Sneaking out in the middle of the night was also popular. Activities like ring-and-run (ring the doorbell and take off), rolling someone’s front yard (toilet paper in the trees), and throwing eggs at oncoming cars from an overlooking bridge, were the most fun.
We didn’t start “car-shopping” (breaking into cars and stealing what-nots) until we were older.
When I was at a friends house who was rich, the plan was to find all the good food (usually candy and snacks) and taste everything that looked good.
Video games, shitty action movies, and sneaking out at night. And if there were girls, different story.
As I got older, into my twenties (ok, I know this forum is sleepover for a child, not 20 year old but . . .) the video games turned to cigarettes, and bridge jumping or swimming at night became fun.
In all my years of haunting the forums, this is the first time I’ve had to block an Avatar! 
My eyes, my eyes! 
Sorry, CP- but I love Firefox! 
Rated R movies, and lots of sugar filled candy (to bad they don’t sell those sugar sticks that you licked and dipped into more sugar anymore, I think they must have caused cancer). Also give them run-through on how to mess with their little friends while they’re sleeping.
Oh yeah and have ninjas break in and battle to the death, that would be cool.
No Hard Gay for you.
For a good sleep over you need one thing, Super Smash Bros.