Alaska Bear Enhance your Life. You won't believe how smooth it feels! Our natural silk sleep masks not only feel smooth against your skin but are also great for those with sensitive skin. Mulberry silk is the fabric of the emperors. It is the most elegant of all the silks with a luminous sheen and a smooth touch. Buy for yourself or as a gift or consider it an investment in your travel accessories. Everyone will love the beauty and Simple comfort of this silk. Why using a sleep mask? The hormone Melatonin regulates the day-night cycle of the human body and controls the recovery phases during the sleep. For the production of this hormone, the human body requires sufficient darkness. Lightness prevents the production of Melatonin. Even a little light caused, by any electronics like your cable box, laptop, digital alarm clock can be a disturbance. The best sleeping mask however will naturally help you increase melatonin levels and increase REM sleep. Sleep masks- what for?