2 under the head + towel on top. The towel's a habit I inherited from my old man, he uses it to soak up drools. I use it to soak up sweat and always ahve a towel ready if I break out in sweat in the middle of the night, which happens a lot. (I think it's some genetic disorder some people have, can't remember the name)
I also like to change pillows around to keep them soft, there're 6 on my bed all for myself.