This compilation of twenty-six scientific papers and philosophical essays expands the mind-body problem of the French philosopher and mathematician René Descartes. We expose the nature of consciousness; we discuss its origin and manifestations in living organisms. We distinguish it from life and elaborate on human existence on Earth. From there, we solve the ancient enigma posited by Epicurus, the Greek philosopher. In science, we take over Schrodinger's works on the body's entropy and use the research of the Japanese Nobel laureate Yoshinori Ohsumi to explain how non-living atoms transition to living molecules, Francis Crick's faded dream that becomes reality. We delve into the living organisms to explain various losses of consciousness and awareness, including sleep, syncope, and death. We mainly focus on sleep to elucidate this mystery that no living organisms escape.