In a study on sleep duration, individuals who experiences long or short sleep durations were more likely to rate themselves in poor health than healthy sleepers. Long sleep duration is defined as getting nine hours or more per night. Short sleep duration is defined as getting five hours or less per night. Normal sleepers are in the range of eight to nine hours per night.
Read MoreStudents in the U.S. lead a list of countries where poor sleep hampers academic performance. With all the distractions in our world today, many students have already experienced an inability to concentrate on math and science problems in school.
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