Modern people have irregular life, lack of sleep at night and no dark sleep environment during the day due to various reasons, resulting in listlessness and low work efficiency during the day. It is so easy to cause confusion of biological clocks and endocrine disorders for a long time, which seriously affect health. The city is full of various lights and noises at night, which is easy to cause poor sleep at night and requires sleep supplement during the day. Eye masks can provide light free sleeping environment for daytime sleepers.