there is one way to preserve a body. Freeze drying with polymerization. This is a long drawn out process that few can afford. The body is flash frozen then placed into a vacuum chamber. This removes all the moisture in the body and then the body is treated which basically turns you into a chunk of plastic. My preference is to lay me out in the open air and let nature take its course. As everyone has said, You are dead and will not know anything going on.