In modern times has changed in many aspects. Some areas may develop better. But on the other hand, may have died as well. Changes to make a daily life, social ideas have changed over time.Even in sleep behaviors of humans today. Schedule relaxation are modified according to the surrounding environment.Social culture of the teenagers in the night, and another cause is the state of mind that affect sleep in the night...Sleep is necessary to humans is very much. Because the time sleep is the body potential development in various fields. Such as repairing the wear and tear of the body, the growth, the conditions of the mind.
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