From the introduction:
Sleep Over is a nasty little roleplaying game where you take the role of a teenage girl who is attending a sleep Over. Together with the other girls you spend the night gossiping about boys, cloths, movies, music, sex, who’s fat, who’s hot, or who’s not. You find out who your real friends are, and who you want to just kill. Be careful though, in this day and age... sometimes girls do kill.