How long sleep to be healthy?

Study found that sleep only 6,7 hours per day than those who slept more than eight hours a day, or less than four hours of death rate is much lower. Among them, the people who slept seven hours lowest mortality, and even people who slept only five hours, this factor should be less than 8 hours of sleep enough people. Experts believe that weekends or holidays with sleep, for young people, it is quite effective, but the long run, will disrupt the body's normal biological clock.

Sleep is a systems engineering In fact, sleep is not down in the pillow, covered with blankets sleepless night, and then opened his eyes and wake up so simple, it is a complex gradual process. Why do we sometimes wake up, the body will magically restore power, and sometimes still feel tired than before sleeping it? This is the depth of sleep and the state of the different result. We need to sleep in the end how long? During the day often head "venting" or drowsy do? Monday morning is always difficult to get up from bed do? If so, you will conclude: "I sleep!" Harm caused by lack of sleep, I believe we are all too familiar: lack of energy, unresponsive, memory loss, reduced immunity, and even premature aging body. The most common argument is that an adult should have the sleep time is 7-8 hours, but the University of California an experiment has come to a sensational conclusion: "The eight hours of sleep a day will make you die more fast. " The experiment six years time from the University of California, San Diego School of Pharmacy and the American Cancer Society conducted jointly. Their one million between the ages of 30 years and 102-year-old object was observed. In this experiment, the age, medical history, health status, etc. have been taken into account, they are with their physical condition with similar objects for comparison. Study found that sleep only 6,7 hours per day than those who slept more than eight hours a day, or less than four hours of death rate is much lower. Among them, the people who slept seven hours lowest mortality, and even people who slept only five hours, this factor bag factory should be less than 8 hours of sleep enough people.