3D Sleep Mask vs Flat Mask: Pressure Test & Complete Buyer's Guide
TL;DR: A 3D sleep mask beats a flat mask for most sleepers. The contoured cups eliminate eye pressure, block 100% of light with an adjustable nose bridge, and stay put during side sleeping. Flat masks work for naps and budget travel, but press fabric directly onto your eyelids. Choosing between a 3d sleep mask vs flat mask can make or break your sleep quality. One eliminates eye pressure; the other...
