大多数人都经历过下午三点左右昏昏欲睡的情况。这时你很难睁开眼睛,会伸手去拿一杯咖啡。但午后三点左右的这种提神饮料可能对夜间睡眠产生很大副作用。如今,一组化学家揭示了无需咖啡因就可保持清醒的方法。它们在使人保持清醒的同时又不会破坏夜间睡眠规律。这些科学家提出一系列提升人体能量级的方法,其中包括观看网上流行的视频、跳舞、听音乐和打开灯等。美国化学学会制作的一段 Most people have experienced drowsiness around three in the afternoon. It is hard to open your eyes at this time and will reach for a cup of coffee. However, this refreshing drink at around 3:00 pm may have a significant side effect on nighttime sleep. Now, a group of chemists have uncovered ways to stay awake without caffeine. They keep people awake without breaking the rules of nighttime sleep. These scientists propose a series of ways to enhance the body’s energy level, including watching videos popular online, dancing, listening to music and turning on lights. American Chemical Society produced a period