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5. Early bedtimes

People who go to bed late on weeknights are more likely to gain weight than their peers who hit the hay earlier, according to a study from the University of California, Berkeley. Dr. Timothy Morgenthaler, president of American Academy of Sleep Medicine said Lack of sleep can affect the immune system. Studies show that people that don’t get a good night’s sleep or don’t get enough sleep are more likely to get sick after being exposed to a virus, such as the common cold.