Grey Alien: We Are Not Physical Life Forms, We Do Not Breath, We Do Not Eat, We Do Not Sleep And We Do Not Feel Pain. We Simply Borrow A Physical Frame To Appear In Your World. You Are Machines As Well, You Exist Through Bone, Muscle, Blood Nerves, And Bioelectricity. You Eat, Inhale, And Excrete. We Exist Through Cosmic Energy. Your Body Is Only A Biological Shell