Nowadays, it is not uncommon to find students doze blatantly in class, if they do not skid or slip out of classes. If a student is unfortunately asked to stand outside the classroom by a stern teacher, he may innocently and pathetically claim that he burned the midnight oil for exams and therefore did not get enough sleep. In fact, according to a recent survey, nine out of ten of students admit to have the same problem, while their reasons for staying up late vary. However, whatever the reason is, staying up too late brings prolonged harm.
The initial stage of staying up too late may not trouble students much, but they do have some mental disturbance. If one sleeps less than 8 hours——necessary sleep hour recommended by health experts, he or she will probably be confronted with various maladjustments. One typical symptom of inadequate sleep is the appearance of lassitude and anxiety. A case in point is the student who once or twice stays up too late fail to focus on any activities, together with being absent-minded in class. Even worse, this symptom often last a few days and if not given notice, one’s biological clock may be broken which will induce insomnia or Moreover, it is worth pointing out that since sleeping at night is totally different from afternoon nap, and the thought that afternoon nap can compensate for lack of sleep is sheer groundless.
However, if you think the above is the entire story, then you are wrong. The truth is with the accumulative effect of staying up too late, students may suffer from what is called “staying-up-late syndrome”, whose mainly symptom is weight-gaining and the flourish of whelks. According to a survey in England, up to 38.7% of students who sleep less than 7.5hours per day begin to gain weight quickly though. Specialists indicate that when a person is deprived of enough sleep, the quantity of leptin, a material that can reduce appetites, declines, causing the increase of the hormone that stimulate appetite. That is why people who used to stay up late tend to feel hungry. Besides, staying up too late is the chief culprit of the incretion disorder as many hormones are secreted during sleep so one is more likely to get more whelk without enough sleep，accompanied with annoying forgettery, impaired vision, testiness, willies and alimentary infection.
Appalled? Not that bad. It is still not too late to keep off the bad habit of staying up too late. As a matter of fact, students have many other choices; for example, they can get up earlier if they real worry about insufficient time for study. After all time is like water in the sponge, you can extrude them. Keep in mind that nothing can replace a regular sleep habit to ensure you of feeling refreshed and vigorous next day.