Not sure what you mean by asking "how", but on the floor usually atop an area rug or mat and head pillow. Often when I sleep on something soft and significantl

Not sure what you mean by asking "how", but on the floor usually atop an area rug or mat and head pillow. Often when I sleep on something soft and significantly deformable like a mattress my neck and/or back are messed up the next day. Never happens on the floor.