There is research that people who sleep less than seven hours a day, often as a flu people easier to relax enough. There is a study and found that people who slept late very often makes the immune system working worse. It's easier to stay Unhealthy body. If the illness will cause illness slowly. In addition, there is not enough room to cause cardiac failure, abnormal heart beat and blood pressure rise. In women, if several successive nights sleeping late at night may cause hormonal system is out of whack, which causes menstruation to slow or speed up.
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