In the modern world, people tend to spend long hours in the offices and buildings, and they focus on the future career. Accordingly, they are keen to sleep less than they used to in the past. However, not receiving enough energy from sleep can lead to stress and lethargy. In this regard, the people around them may feel discomfort and inconvenience. After pondering this phenomenon, I believe that shortage of sleep can affect the people negatively, and often reduce their efficiency and productivity at work.