Pillows became my best friends post surgery. The Wedge helped me lay on my back since it hurt for me to lay on my sides due to my drains. It also made laying in an upright position more comfortable and easy. My counselor friend, BP, bought me a body pillow. The body pillow was very comfortable to lay my head on or put on the side of me. I would definitely recommend both types of pillows, the more comfortable you are, the better you sleep!
(I do not have a medical background, this post was written base on my personal experience.)