7 Things Women With Really Healthy Hair Always Do

"Cotton absorbs moisture — no matter how expensive or how high the thread count is," Townsend explained. "So it's going to steal the moisture from your skin and your hair while you sleep."

He recommends choosing a sateen (cotton coated in polyester) because it's cooler, so you won't sweat as much or tangle and roughen up the hair. Plus, he promises it makes a blowout last much longer.

Savvy Sleepers 100 Percent Satin Pillow Case in White Russian ($36), part of the October POPSUGAR Must Have box