Im 15 and so if my girlfriend. Theres a party in a few weeks and its going to be finished late, and i live a good 1hr and half away from it. my girlfriend lives like 10mins. Im likely going to be off my head and so will she. and i dont want my parents to see me like that ( her parents let her do it all the time ) how do i persuade my parents to let me sleep over hers, if i just tell them im going to a gathering with her mates???