~sleep lexicon~

  1.  Insufficient sleep has an estimated economic impact of over $411B each year in the United States alone (NIH).

  2. Drowsy driving is responsible for more than 6,000 fatal car crashes every year in the United States (CDC).

  3. Nurses working 12.5-hour shifts report committing more than three times as many medical errors than those working 8.5-hour shifts (NIH).

  4. Active duty service members are 34% more likely to report insufficient sleep than people with no history of military service (NIH).

  5. More than 90% of people with PTSD related to military combat have been found to have symptoms of insomnia (VA).

  6. The average adult needs between 7-9 hours of sleep each night (CDC).

  7. School age children need 9-13 hours of sleep every night (CDC). 

  8. In healthy adults, caffeine has a half-life of five hours, which means that around half of the caffeine consumed will be eliminated from the body in five hours (NIH).

  9. Drinking more than two servings of alcohol per day for men and more than one serving per day for women has been found to decrease sleep quality by 39.2% (NIH).

  10. About 80% of people who take prescription sleep medications experienced residual effects like oversleeping, feeling groggy, or having a hard time concentrating the next day (NIH).

  11. In a normal sleep period, a person experiences four to six sleep cycles (NIH).

  12. REM sleep makes up between 20-25% of total sleep in healthy adults (Harvard).

  13. On average, we spend about two hours per night dreaming (NIH).

  14. The key driver of the body’s circadian rhythm, or internal clock, is the suprachiasmatic nucleus (SCN) in the brain, which is made up of around 20,000 neurons (NIH).

  15. Body temperature during sleep drops by one to two degrees Fahrenheit (Harvard).

  16. Jet lag is worse when you fly eastwards because our circadian cycle is slightly longer than 24 hours.

  17. Metabolism drops by around 15%6 during NREM sleep (NIH).

  18. 35.2% of all adults in the U.S. report sleeping on average for less than seven hours per night (CDC). 

  19. Between 10% and 30% of adults struggle with chronic insomnia (NIH).

  20. It is believed that between 30% and 48% of older adults suffer from insomnia (NIH).

  21. Women have a lifetime risk of insomnia that is as much as 40% higher than that of men (NIH). 

  22. Almost half of all Americans say they feel sleepy during the day between three and seven days per week (Sleep Foundation).

  23. At 43%, Hawaii has the highest percentage of adults who get seven or fewer hours of sleep per night (Hawaii). 

  24. South Dakota, at 26%10, has the lowest percentage of adults who get seven or fewer hours of sleep per night (South Dakota).

  25. 42.6% of single parents sleep less than seven hours per night compared to 32.7% of adults in two-parent homes and 31% of adults with no children (CDC).

  26. 32.6% of working adults reported sleeping six or fewer hours per night in 2017-2018, up from 28.4% in 2008-2009 (CDC).

  27. More than 44% of workers in production-focused industries, such as factory workers and plant operators, report getting seven hours of sleep or less per night (CDC).

  28. Active duty service members are 34% more likely to report insufficient sleep than people with no history of military service (NIH).

  29. About 16% of full-time workers in the U.S. worked evening or overnight shifts in 2017 and 2018 (BLS).

  30. 75 minutes of high-intensity exercise or 150 minutes of moderate-intensity exercise per week has been associated with reduced levels of daytime sleepiness and better concentration even when tired (ScienceDirect).

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