In a fridge.
I used to live in an apartment. One winter, my roof started leaking(to the point of breaking apart and molding) in my room, so the apartment complex offered me the apartment downstairs as a bedroom. Now, I was 17. That was great. A whole apartment to myself. So, I gave my friend a key and I kept one for myself. One day, he called me and said he was on his way over. I removed the shelves from the fridge, hid them in the bathroom, and got in the fridge to scare him when he came over. Problem was, he changed his plans and never made it over. I slept in the fridge for a good 3 hours.
I also took a 30 minute power nap in a field once. My friend and I were going sledding far away, and on the way back it started snowing hard. We couldn't see, and we were freezing. So, we dug two holes real quick, laid down in them, and put our sleds over us. Nice n warm.