Somnia 4.5 Contour Pillow - Side Sleeper SupportPerfect height for most side sleepers Hi there. Dorothy here from Mattress Miracle. The Somnia 4. 5" Contour Pillow is my most popular recommendation for side sleepers. After 37+ years helping folks find the right pillow height, I know the 4. 5" works well for most people who sleep on their side. Why 4. 5 Inches is the Sweet Spot When you sleep on your side, you need a pillow that fills the gap between your neck and the mattress. The 4. 5" height is