Did you sleep well last night? According to The Huffington Post, chronically sleeping fewer than 6 hours a night increases stroke risk by 4.5 times compared to those getting 7 to 8 hours of shut-eye. The consequence of sleep deprivation includes not only physical diseases like high blood pressure, diabetes and obesity, but also psychological damages, such as the decline of concentration and memorization. Therefore, it is essential for people to have plenty of quality sleep. In the first place, having plenty of quality sleep plays an important role in maintaining our health. As it is known to us, our bodies and minds relax while we sleep, so that we won’t get sick for overworking. In addition to that, sleeping keeps immune system active and effective as well. Furthermore, sleeping helps speed up the recovery of internal organs. In the second place, plenty of quality sleep guarantees the high efficiency of work and study. When sleepless, people are more likely to lose control of their mood, being either irritable or depressive, which could the obstacles of concentration. Therefore, sleeplessness results in work and study with lower qualities. On the contrary, those who have plenty of quality sleep, being energetic and resourceful, are able to work efficiently. Taking all the reasons I mentioned above into consideration, no one can deny the significance of sleep to human beings. After 8-hour shut-eye, people are full prepared for devoting their time to work with energetic bodies and refreshed mind.