Sleep. I bet you could use some.

Twenty-four hours in a day usually doesn’t seem like enough to “get everything done,” does it? Exercise and sleep are often sacrificed in our busy lives.

You may think that you’re tough – that you can “get by” on just a few hours of sleep. I assure you, you are wrong. Your “sleep debt” (the accumulated lack of sleep that causes daytime fatigue) will catch up with you.

Consider this statement: “the effects of sleep deprivation are actually so damaging that it is now prohibited as a method of interrogation in most countries.”1

And yet so many of us consistently deprive ourselves of sleep – by choice!

Sleeping baby. Flickr: storyvillegirl

Americans are sleepy people. Sleep studies have revealed that the average American’s sleep debt is likely close to 25-30 hours at any given time.2 According to the National Sleep Foundation’s most recent poll, 63% of American adults report that their sleep needs are not being met, and 43% report that they rarely or never get a good night’s sleep on weeknights. As a result, according to data from the CDC, 37.9% American adults report falling asleep unintentionally during the day in the preceding 30 days – a sign of being dangerously sleep-deprived.2

Daytime sleepiness is dangerous. Inadequate sleep is a health hazard; even worse, the resulting daytime fatigue impairs performance (just like alcohol). Sleep-deprived people perform tasks poorly, make more mistakes, and experience more accidents at work – it’s similar to being intoxicated.3 One Australian study showed that 24 hours without sleep is equivalent to a blood alcohol content of 0.1% (0.08% is legally drunk in most U.S. states) with regard to hand-eye coordination. Being awake for only 17-19 hours still impaired hand-eye coordination – this was equivalent to a blood alcohol content of 0.05%.4 Numerous accidents – of small and large scale – have been attributed to fatigue; from medical errors to plane crashes to the Exxon Valdez oil spill.2

More consequences of inadequate sleep:

  • Impaired immune response.5 The quality of sleep before becoming infected is a significant determinant of the severity of cold symptoms. Even one night of inadequate sleep reduces the number and activity of natural killer cells the next day.2
  • Impaired learning and cognitive function– blood oxygen levels in the brain are measurably lower after insufficient sleep.6,7
  • Increased snacking – lack of sleep results in dysregulation of hunger and satiety hormones.8,9
  • Weight gain, impaired insulin sensitivity, and increased risk of diabetes.10-13
  • Increased inflammation, high cholesterol, and hypertension.14,15
  • Diminished appearance - sleep-deprived people look less healthy and attractive than well-rested people.16
  • Emotional disturbances and excessive emotional reactivity.17
  • Increased risk of death.18

What is sleep and why is it so important?
The question ‘what is sleep?’ is still somewhat of a mystery. Sleep occurs in 90-minute cycles of REM (rapid eye movement) and non-REM sleep; REM sleep is thought to be the most restorative part of the sleep cycle; REM sleep is thought to contribute to brain development, and almost all dreaming occurs during REM sleep. Tissue repair and growth (in children) is heightened during sleep.2 Also during sleep, our brains ‘stabilize’ newly formed memories, which is one reason why lack of sleep can impair learning (caffeine does not help, by the way). This is thought to occur by the brain ‘replaying’ brain activity from waking experiences during sleep. Interestingly, the greatest impact of sleep deprivation is on memories associated with positive emotions, compared to those associated with neutral or negative emotions.17 Sleep is also thought to fuel creativity, since creativity is dependent on learning, memory, and motivation.2

Sleep, like good nutrition and exercise, is an essential component of a healthy lifestyle. Don’t try to be tough – practice self-care and make sleep a priority. Maybe you didn’t finish everything on your mile-long to-do list. Let it go - you owe yourself some rest!

 

References:

1. Hunter P: To sleep, perchance to live. Sleeping is vital for health, cognitive function, memory and long life. EMBO Rep 2008;9:1070-1073.
2. Dement WC, Vaughan C: The Promise of Sleep. New York: Delacorte Press; 1999.
3. Swanson LM, Arnedt JT, Rosekind MR, et al: Sleep disorders and work performance: findings from the 2008 National Sleep Foundation Sleep in America poll. J Sleep Res 2011;20:487-494.
4. Williamson AM, Feyer AM: Moderate sleep deprivation produces impairments in cognitive and motor performance equivalent to legally prescribed levels of alcohol intoxication. Occup Environ Med 2000;57:649-655.
5. Opp MR: Sleeping to fuel the immune system: mammalian sleep and resistance to parasites. BMC Evol Biol 2009;9:8.
6. Miyata S, Noda A, Ozaki N, et al: Insufficient sleep impairs driving performance and cognitive function. Neurosci Lett 2010;469:229-233.
7. Taras H, Potts-Datema W: Sleep and student performance at school. J Sch Health 2005;75:248-254.
8. Kim S, DeRoo LA, Sandler DP: Eating patterns and nutritional characteristics associated with sleep duration. Public health nutrition 2011;14:889-895.
9. Aldabal L, Bahammam AS: Metabolic, endocrine, and immune consequences of sleep deprivation. Open Respir Med J 2011;5:31-43.
10. Gangwisch JE, Heymsfield SB, Boden-Albala B, et al: Sleep duration as a risk factor for diabetes incidence in a large U.S. sample. Sleep 2007;30:1667-1673.
11. Spiegel K, Leproult R, Van Cauter E: Impact of sleep debt on metabolic and endocrine function. Lancet 1999;354:1435-1439.
12. Mozaffarian D, Hao T, Rimm EB, et al: Changes in diet and lifestyle and long-term weight gain in women and men. N Engl J Med 2011;364:2392-2404.
13. Patel SR, Malhotra A, White DP, et al: Association between reduced sleep and weight gain in women. Am J Epidemiol 2006;164:947-954.
14. Gangwisch JE, Malaspina D, Babiss LA, et al: Short sleep duration as a risk factor for hypercholesterolemia: analyses of the National Longitudinal Study of Adolescent Health. Sleep 2010;33:956-961.
15. Gangwisch JE, Heymsfield SB, Boden-Albala B, et al: Short sleep duration as a risk factor for hypertension: analyses of the first National Health and Nutrition Examination Survey. Hypertension 2006;47:833-839.
16. Axelsson J, Sundelin T, Ingre M, et al: Beauty sleep: experimental study on the perceived health and attractiveness of sleep deprived people. BMJ 2010;341:c6614.
17. Walker MP: The role of sleep in cognition and emotion. Ann N Y Acad Sci 2009;1156:168-197.
18. Cappuccio FP, D'Elia L, Strazzullo P, et al: Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studies. Sleep 2010;33:585-592.

 

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Comments (10) Read through and enter the discussion with the form at the end
Sabrina - January 13, 2012 11:37 AM

I sure could use some sleep and I have no doubt it is extremely important. It is a frustrating topic for mothers of young children though. Sleep is probably the top thing on my list, but with a 5 yr old, 2.5 yr old and 5 month old breastfed baby, sleep is something I can only wish for at times. I'd like to hear more practical solutions for how moms in our situations can actually get enough sleep, not just more studies about how important it is. We know how important it is because we start to feel pretty crazy without it.

Peter T - January 13, 2012 1:09 PM

Thank you for the interesting article on sleep. I am doing a better job lately of getting more sleep and I can see how it definitely helps.


Thank you,
Peter

Dick Baker - January 13, 2012 4:01 PM

I would love to get a consistent good night's sleed. I go to bed at 10:00pm and am asleep by 10:30pm. I consistently wake up every couple of hours and, when I wake up between 4:30 and 5:30, I might as well get up because I can't get back to sleep. I do doze off in the late afternoon to early evening and I hate it.

mike rubino - January 13, 2012 7:22 PM

Good article. I know that lack of sleep hits me like a Joe Frazier left hook !!

mike rubino - January 14, 2012 7:07 AM

Deana , Good job and well written. I know for myself sleep is very important . Less sleep equals higher morning BP right off the bat for me.

Keep up the good work .

Mike

nancy hansen - January 14, 2012 1:33 PM

I have tried this program for a week. I am so tired of tomato taste in everything. I gag when I taste it. Can I eaat any stews without tomatoes and still follow the diet?

Vicki - January 14, 2012 3:07 PM

For Sabrina, I remember those days when my children were young. Whenever they were asleep, I always took a nap; the housework could always wait. Sleeping with the breastfed baby near your bed (in a crib?) will help cut down on interruptions, you will not have to go far to feed him. You are doing a wonderful thing for your child's health, my children who nursed enjoy excellent health, the adopted ones less so. This phase will pass before you know it, my kids are now 15 to 37.

Dalores - January 14, 2012 11:26 PM

I've noticed that I have a really hard time controlling the snacking when I don't have enough sleep.

Melissa - January 21, 2012 11:10 AM

What are the recommended hours of sleep? I know these vary from person to person, but what is the minimum amount recommended?
Thanks for a great article, Melissa


Pat Tyrrell - February 20, 2012 12:18 PM

Well, for those of us with jobs that entail shift work, getting enough sleep is near impossible. I work 10 hour days, and 14 hour nights. Maximum number of nights worked is 4, unless I agree to overtime, but the hardest shift is 3 days, followed by 3 nights (F/Sa/Su days, M/T/W nights). The last time I remember getting a relatively undisturbed sleep was when I was anaesthetized for my colonoscopy... =:-{

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