Caffeine and sugar like coffee or soda are believed to become the regular and preferable food for overnight employees because such food is effective in reducing the tired feeling and help workers stay awake. However, caffeine can lead to sleep issue in the daytime, the ones working through the night could get with insomnia that causes bad eating habits. Thus, nightshift people should take caffeine amount into consideration with regard to their own health. A Retailer is a middleman who sells the goods directly to the end consumer, which is in the final stages of commodity circulation relative to producers and wholesalers. The basic task of the retailer is to serve the final consumer directly. Its functions include purchasing, marketing, adjusting, saving, processing, breaking down, subcontracting, delivering information and providing sales services. In terms of location, time and service, it is convenient for consumers to purchase, and it is also a bridge connecting production enterprises, wholesalers and consumers, which plays an important role in the distribution channels. 4. Energy