The choice of eye masks is also particular. The best choice is natural and soft cotton products. The most comfortable one is the eye mask made of super soft flannelette. And the eye mask should be dark to avoid light. Secondly, when wearing the eye mask, it must be tight and breathable. Too loose is easy to slip in sleep, which makes the eyes stimulated by light, and too tight is easy to compress the nerves around the eyes, affecting the blood circulation.