The idea that swapping out your cotton pillowcase for one made from silk can fight wrinkles and banish bedhead seems way too good to be true (not to mention a solid waste of hard-earned cash). But the truth is, this simple switch actually can make a difference in the appearance of your skin and hair, according to Debra Jaliman, MD, a New York City-based dermatologist and author of Skin Rules, who told Prevention.com about the benefits of silk pillowcases for hair and skin in a previous interview.

slip for beauty sleep Slip Silk Pure Silk Queen Pillowcases

slip for beauty sleep Slip Silk Pure Silk Queen Pillowcases

slip for beauty sleep Slip Silk Pure Silk Queen Pillowcases

$125 at Nordstrom

Dr. Jaliman's explanation: Unlike cotton, which tugs at your skin and hair all night and sucks away moisture, silk pillowcases provide a smooth, frictionless, and nonabsorbent surface. The result: waking up fresh-faced with a tangle-free mane.

Silk pillowcases don’t come cheap, and they are rarely discounted, but a dermatologist and celebrity favorite is marked down for the Nordstrom Anniversary Sale. Slip Silk Pure Silk Queen Pillowcases are 30 percent off through August 5. You'll get two luxurious cases for $110, a $158 value.

Check out other beauty steals at the Nordstrom Anniversary Sale, and if you see something you like, don't wait—these beauty deals tend to sell out quickly.

From: Prevention US