I bought a Japanese pillow. It is filled with buckwheat shells. They make a slight noise, so I overplayed it with a bit of fleece from an old hoody, which can't be noticed through a silk pillowcase I've also invested in.
It supports my head and more importantly, my neck in a straight line ALL night. I don't snore anymore and if him indoors' apnea ucks in, I pass it to him and it disappears! Another nice side effects is that when I sleep on my side it sort of cradles my face and I've noticed fewer creases on my face when I wake up, and my wrinkles seem smoother.