Tik Tok's sleep-assisting decompression video was downloaded from the commercial material library of relevant websites. Material library refers to the spare materials for doing something, including complete and fragmented materials, and also refers to the collection of good materials. Video has the characteristics of large amount of information and strong appeal, which is suitable for showing the details of things and presenting some unfamiliar things. Video materials can be collected by video compression card to convert analog signals into digital signals, which can be directly intercepted from VCD or recorded by screen capture software.