3D Sleep Eyes Masks Sleeping Mask Light Blocking Adjustable Strap for Travel Too much exposure to light during sleep can mess up the inner clock considerably. Even if we don't wake up from the exposure to light, it has a significant effect on the quality of the sleep phase. The reason for this is the sleep hormone melatonin, which is released by the body in the dark. It makes us tired and ensures a deep sleep. This process is hindered by exposure to light. A sleep mask completely darkens our surroundings. Thus, the sleep hormone melatonin is released - regardless of whether it is still light outside, we sleep during the day or e.g. on the plane. As a result, we not only find sleep better, but also ensure a significant increase in sleep quality. Our sleep mask is designed from ergonomics. The last designed the nose area, keep out the light from below, just like sleeping in a room where the lights are off. The deeper 3D curvature sleep mask is designed to allow your eyes to blink freely and never touch your eyelashes/eyelids/eye makeup, whether you are flying, playing, working or traveling, absolutely stress free, this is our sleeping mask. The Best Choice Take this out Incredibly lightweight and comfortable sleep mask anywhere - in bed, on the flight, on a long drive, camping - and enjoy uninterrupted, deep, restful sleep. Package: 1 Sleep Eyes Mask