My program recommended a positioning wedge to make it easier to get in and out of bed. Also, lying flat can be extremely painful for some post-op and having that little angle makes it a million times more comfortable. They also warning lying on your side can cause pulling at your newly healing incisions and could be painful. I'm the over-prepared type, so I bought the stupidly expensive wedge and ohhhhh man was it worth it! It was a total game changer for me post-op. I was a side / tummy sleeper normally and having that little incline made lying on my back so much more comfortable. It also helped getting out of bed without using my stomach muscles too much. I'm farther out post-op now but I refuse to give up my wedge because it's more comfortable for me now.