Better Sleep for Better Health. How do you clean a memory foam pillow? The Side Effects Of Buckwheat Pillows. As the name suggests, buckwheat pillows are stuffed with buckwheat husks. Rather than poly fiber filling, foam or feathers. Formerly used in the Eastern countries, they have become quite popular for many reasons. The side effects of using buckwheat are actually beneficial and positive. These pillows can guarantee better sleep. Since it supports your neck and head completely, prevent.