Silky smooth isn’t just an expression. The luxurious fabric can help keep your hair soft, moisturized, and free of pesky tangles. “Sleeping on a cotton pillowcase will cause hair to bunch, knot, and dry the hair out causing breakage with silk the hair will slide, which is much less damaging.” Silk may also help preserve your style while you sleep. “One of my favorite beauty tips for women is to wrap a silk scarf around your head when you sleep. “The oils won’t increase as much in your hair, and you’ll be able to hold on to your hair style longer.