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There is a youth hostel in Jena. Be sure to get there nice and early, because there's nowhere else. The tram heads there, you should ask somebody for directions. If you get really stuck, the McDonald's at the service station, although not 24h is open til midnight, and opens again 7 the next morning. If you leave McDonald's at midnight, cross the road, and climb the stairs opposite the car dealership on the back of the warehouse, there's a sheltered area where you can stay for the night. It's not warm, but if you go into McDonald's the next morning, you can use the bathroom to brush your teeth and have a shave, and somebody behind the counter might recognise you and sort you out with a cup of tea. Couchsurfing and Hospitality Club is also quite very active in Jena.