1, a daily nap, good for the heart. 2007, Harvard School of Public Health study of 24,000 adults found that, compared with people who do not nap, the likelihood of death from heart disease will be reduced by 40 percent for people who nap. An American study at Allegheny College found that a 45-minute nap can also lower blood pressure. The United States Thomas Jefferson University sleep disorders research center director Karl? Doug Hamicki think, in fact, do not need a long nap, when there is sleepy time to lower the head to close the eyes effect is also very good. 2, napping between 12-13 points to avoid weight gain. An early study conducted by Columbia University compared the relationship between sleep patterns and obesity found that people who sleep 5-7 hours a night than those who sleep 7-9 hours a night obesity possibility increased by 50%; only 2-4 hours of sleep a night, obesity possibility increased by 73%. Between 12 and 13 o’clock, most people’s physical fitness will be in decline, the most suitable for napping. Do not nap too late, 15:00 pm after the nap will affect the quality of sleep at night. 3, no bed should also take a nap to help sexual health. A survey by the National Sleep Foundation found that: one-third of women feel so fatigued that even their sex drive is gone. A study by the University of Chicago found that 24-year-old men who sleep less than five hours a day, their body testosterone levels are only equivalent to a 15-year-old boy. Declining testosterone levels will reduce libido and the “ability to operate” in sex. 4, a cup of coffee before the nap to improve alertness. Lack of sleep can lead to an increased likelihood of safety accidents for drivers, shift workers and others. A study published in the Journal of Sleep showed that an effective 10-minute nap will greatly enhance the body’s alertness. The study found that drinking a caffeinated beverage before a nap would make sleepy drivers more alert, an effect more pronounced than drinking coffee alone or sleeping alone. This is because the active ingredients of caffeine need 30 minutes to enter the brain, so after the nap, it will be because the concentration of caffeine in the body and fully improve alertness. 5, sleep for 10 minutes to improve memory and creativity. Sleep can convert temporary memory into permanent memory. Research at the University of California, Berkeley, found that people lose part of their ability to absorb new knowledge every day, and napping can reverse this decline. A study published in the Journal of Sleep showed that a 10-minute nap is the optimal length to restore cognitive function. But for creative thought processes and important memory consolidation, a long nap of at least 60-90 minutes is needed.