How sleep affects health?


    How sleep affects health?

  • 1 Less sleep makes people breathe in less oxygen and have a disrupted heart beat

    Lack of sleep increases the body's stress hormones (adrenalin and noradrenalin). Those then increase a person's heart rate and decrease the amount of oxygen breathed in. The French study was published in the European Journal of Applied Physiology and Occupational Physiology in 1991.

  • 2 1 hour of additional sleep raises testosterone

    A man who sleeps for 1 additional hour has 12% more testosterone. The study was done at the National University of Singapore in 2010.

  • 3 1 hour of additional sleep reduces fat

    Each hour of extra sleep reduces a person's fat percentage by 3%. The study was done at the University of Bristol and published in Nutrition in 2007.

  • 4 Good sleep decreases chances of getting cold

    People who have a good sleep have 3 to 6 times less chance of getting a cold because it positively affected the immune system. The study was done at Carnegie Mellon University in 2009.

  • 5 Less sleep doubles chances of getting a heart attack

    People who deprive themselves of sleep double their chances of getting a heart attack. The study was done at University College London in 2007.

  • 6 Good sleep makes people recover faster from viral infections

    People who are recovering from viruses do so faster if they get some good sleep. The study was done at the University of Luebeck and was published in the Journal of Immunology in 2011.

  • 7 Extra sleep can double testosterone in older men

    Older men who had enough sleep almost doubled their testosterone levels. The study was done at the University of Chicago and published in Sleep in 2007.

  • 8 Less sleep makes people less sensitive to insulin

    People who deprive themselves of sleep have decreased insulin sensitivity almost immediately. Just one night of 4 hours of sleep is enough to reduce sensitivity by 20%. The study was published in the Journal of Clinical Endocrinology and Metabolism in 2010.

  • 9 Less sleep reduces testosterone in men

    Men who sleep less or have a disrupted REM phase of their dreams produce less amounts of testosterone. The study was published in the Journal of Clinical Endocrinology and Metabolism in 2001.

  • 10 People who sleep over the day put on weight easier

    People who go to bed late and wake up late put on weight easier. The study was done at the Northwestern University and published in Obesity in 2011.

  • 11 Good sleep makes dieting easier

    Lack of sleep stimulates the appetite. Those who sleep less can easily gain 1 kilogram of fat in only 2 weeks time. The study was done at the University of Chicago in 2010.

  • 12 Sleep deprivation reduces muscles

    A study showed how sleep deprivation reduces muscle mass in just one week by 20%. It was done at the University of Sao Paulo in 2012.

  • 13 Quality sleep affects longevity

    The better the quality of a person's sleep is, the longer that person will live. The study was done at the University of Pittsburgh during a 13 year span and published in Psychosomatic Medicine in 2003.

  • 14 Afternoon nap makes people live longer

    A study was done on the oldest people of the island of Ikaria in Greece, which showed how their habit of afternoon nap contributed to their longer life. The study was done at the University of Athens in 2011.

  • 15 Less sleep makes younger people put on weight around the waist easier

    People younger than 40 put on weight around their waists easier if they sleep less. The American study was published in Sleep in 2010. 

  • 16 Less sleep makes people look less healthy

    Less sleep makes a person look less healthy, cosmetically at least. This is because people who sleep better are healthier than those who don't. This will make their offspring stronger and healthier too. The study was done at the Swedish Karolinska Institutet in 2010.