You might recall from a previous blog post that you should be sleeping on the non-painful side – never sleep on the sore side as invariably you will cause more pain.
There are two places you can try to put the pillow. The first is underneath the armpit of the bad shoulder. Second, when lying on your side, double up the pillow next to your chest and with the pillow resting between the chest, shoulder and bed.
By using correct pillow positioning, you will give the shoulder adequate support. Some people, however, find that sleeping on either side is very painful (for example post-surgery), and hence sometimes it’s necessary to sleep in a reclined position on your back, or in an arm chair.