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Currently we require about 7.5 hours per day for sleep. This time, among adults, varies from 6 to 9 hours. With advance of chronic diseases (asthma, cancer, diabetes, cardiovascular problems, COPD, etc.), people generally sleep longer. Practical experience and clinical studies showed that voluntary sleep restrictions (e.g., only 3-5 hours) are impossible to maintain. Sleep deprivation experiments, conducted on animals, demonstrated loss of appetite, loss of weight, and gradual death.