Oktoberfest is the world's largest beer festival held annually in Munich, Germany. Being the largest beer festival means accommodation during the festival is either super-expensive or hard to book within a short notice. Showers, breakfast, lunch and beer are available without reservation, so a place to sleep is the only problem.

My friend has a small minivan which is convenient enough for sleeping. Would it be legal to find a quiet parking space somewhere (relatively) close to Oktoberfest and just sleep in the van? Bonus points for recommending a good spot to park in that area.