Funny- just last night I slept on the ground in a secluded beach with only a futon. Sheltered on 3 sides by a small mountain from what little population was inland. It was awesome. i dreampt of sinking deep down into the earth. Had that heavy, cozy feeling deep in my brain of actual REAL sleep which I havent had for over 2 years. Hell I almost forgot that feeling. maybe I have never had it!!!
I look at it this way- when you are living in a little cube full of wires and electrical currents in a civilization full of thousands of crazy people and dissonant frequencies constantly bombarding you- that is going to be your home and is what you will dream of. But when you sleep on the earth in nature your home is all of a sudden the entire planet, and it is peaceful and vast.