most students are lack of sleep. The reason is two.
first if they don't have much time, reduce their sleep. it is harmful to health. May be most people agree about this.
second is the wrong idea for sleep. Do you want expand on second idea?
sometimes people go to bed with the chickens 'for get up early(at least before5o'clock).
According to researchers ....
Generally rhythm of human life is not suitable for this way. So as that way goes on, the rhythm really goes to pot.
And then you are becoming more and more tired by wrong sleep. that is not particularly good about your study too.
So you don't need to trust blindly about 'theory of early-morning person'.
This broad topic includes diet, exercise, smoking, alcohol, and unit 5 of Authentic English Readings for Advanced Students.
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