Another one here for holding a pillow to sleep - I do this on my side, or on my stomach (one arm over the pillow), and sleep in an undershirt and a t-shirt.
Not much luck falling asleep on my back, but it seems related to feeling like my front is "exposed" that way, despite being in my own room, door locked, clothed, and under blankets. Hope it'll be easier to sleep on my back after top surgery, otherwise things are going to get very interesting, haha.