What are some fun pranks for a sleepover?

I am having a sleepover party soon, and one of the friends who is coming and I have decided to fill the party with pranks. We are looking for more harmless ones, so no shaving eyebrows or anything like that. So we are basically looking for ones that will be quite simple and not too mean, but at the same time lots of fun. As some extra information, we are girls, we are most likely all sleeping in the same bed and we will be sleeping in a camper bus.
Thanks :D