I used to go on camping trips regularly. I always found that I woke up exceptionally well-rested in a tent. I attribute that to a combination of the fresh air

I used to go on camping trips regularly. I always found that I woke up exceptionally well-rested in a tent. I attribute that to a combination of the fresh air, the possibility of a gentle breeze, and the difference of outdoor sounds vs. a 60Hz hum in the house. And it's not about sleep length, either; I would always wake up earlier in a tent than in my bed. I think the phenomenon is worthy of more in-depth scientific experimentation, but I wouldn't ignore my own experience; even with no control group and a sample size of one.