Her dermatologist advised sleeping on a silk pillowcase. Unable to discover one, she sourced the greatest silk she could discover and wrapped it about her pillow. Dr. Warwick Nettle, FRACS, from Sydneyâ€™s Silk wood Medical advices (in Madison Magazine) investing in silk pillowcases about Anti-Ageing, Anti Sleep-Crease Silk Pillowcase by SLIP. New York Celebrity dermatologist Patricia Wexler, M.D said that repetitive motion damage from side-sleeping and counsels which sleeping on Slip can discourage facial crinkling as it's slippery texture. Great the secret of film divas, Slip arrests facial skin from creasing during the night. Silk permits the skin to glide along the pillow such the face rests comfortably no placing pressure on creased skin, effectively "ironing" in wrinkles.