Buckwheat pillows
So, I have been sleeping on a Buckwheat pillow for about 10 years now. I don't particularly love it, but pillows are a hard habit to break.
The nice thing about the buckwheat pillow is that it is fairly moldable. You can kinda dig in it with your head, and when you stop digging it keeps it's shape.
The pillow is rather hard to the touch, but it is plenty comfortable when you head is resting on it. It makes a funny noise when you shift around. My cats have absolutely no interest in sleeping on it, which makes me happy.
My head never gets hot when It is on the buckwheat pillow. There is a lot of space between each buckwheat hull, so the heat circulates pretty easy.
I have been using my buckwheat pillow for about 9 years, and it has held up well. Originally my wife bought a couple Sobakawa pillows off an infomercial.. They where way too small. I called them Sock-it-to-me pillows. I liked the concept enough that I ran out to the store and bought a regular sized pillow.