For many years, pillows have been filled with duck and goose feathers that, while soft in the beginning, compress throughout the night, leaving your head to rest on a flatbed of fluff. This lack of support found with down pillows has led some traditional users to experience unsavory health complications. Specifically, for those who mainly sleep on their sides, it’s common to experience stiff necks each morning due to improper alignment of the spine. There are many side sleeper options on the market, and many of them are foam based.