A rock for a pillow

I’m a truck driver and I sleep in the bunk in the back of my truck, often with other trucks rumbling by. When I’m at home I sleep like a baby without all that noise and vibration. For the last several years I have been sleeping on a futon mattress placed directly on the floor. After going camping several times I discovered that I sleep well on a thin pad. For the last 13 months I’ve been sleeping on a 1/2 inch foam mat on the floor. You’d be surprised what you can get accustomed to.