How can I sneak my girl in the house if my brother won't let me?

Ok so I'm 19 and she's 20 and I have my own room at my parents house and all and wanted my girlfriend whom I've dated a year and a half to come over and sleep together, but my brother's room is above the garage and I can't just pick her up without waking his *** up. Please help, I don't want to spend money on a hotel, they're nasty anyway, have you ever taken a black light to those places? I digress, what's a way I can do this? Spare me the religious talk.. I want answers I'll actually be able to use.