Nothing can ruin a good night’s rest like not having the right pillow. You could bring your pillow from home from home, but it is probably too wide to use without suffocating the person sleeping next to you.
Camping pillows are smaller than normal pillows and most are inflatable so that you can blow them up to the right amount of firmness for a comfortable sleep. Many of them are also the right size to fit in a pillow pocket in your sleeping bag so that the pillow does not move around as you sleep.
Sea To Summit Aeros Premium Pillow – inflatable, very comfortable
Therm-a-Rest Compressible Pillow – foam pillow, multiple sizes and colors