The wrong pillow can disrupt sleep, so finding the right one can guard against decline in mental and physical health I thought I found the perfect pillow. Could these three unseat my favorite? Life is full of mysteries: What is dark matter? What happened to DB Cooper? And the most perplexing to me personally: how tall should pillows be? I can never seem to find the right pillow. They always seem too soft and flat, or too tall and stiff, and I end up tossing and turning all night. Currently, there are six pillows on my bed, none of which are quite right.