Up until last night, I was sleeping on a mattress on the ground. While this worked, and while the mattress was thick enough to provide me with enough insulation, there was always a big draught along the first foot or so above the floor.
Last night, I finally purchased some lumber and constructed my bed “platform.” I use the term platform rather than frame because quite simply, this is more than a frame. It is a solid two feet above the floor, not counting the mattress. This allows me to stay above the draught, but also to easily store Rubbermaid containers underneath of it. Last night I was lying in bed, and even though the wind howled fiercely (even worse than here, but this time, no harpoon came through the tent!) I was untouched by it!