For me, I found that my hips got very sore on when I slept on my sides and I always wound up flat on my back when I wasn't supposed to be.
I decided to try this pillow (think I bought it from CVS at the time):
http://www.improvementscatalog.com/h...ge-pillow.html
It worked well for me & we've used the individual parts when we've been congested, or whatever the case. It's sort of like be in a 'recliner' type position. I just wish that it was a little wider, my arms hang off the sides, so I just use two neck roll type pillows. Just another option