Preferred sleep position?

I have read articles on bed and pillow elevation and have slightly raised the head of my bed accordingly. However, I was wondering if there is a preferred sleep position regarding IOPs? I have a habit of sleeping on my stomach and then twisting my neck so that my head lays sideways on the pillow (not face down etc). However, after reading articles regarding how neck pressure from tight collars can elevate IOP, I wonder if this position with neck twisted might not do the same.