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July 31 2012

Being Alert to Sleep Apnea

Category:  Health

Modern life has been hard on sleep. Millions of people resort to sleep aids, either over the counter or by prescription, in an effort to pass the night without insomnia or disrupted sleep. But as common as it is for us to complain when we didn’t get a good night’s sleep, there’s a very common disruption that tends to get overlooked: OSA, or obstructive sleep apnea. The name is becoming more common, unfortunately, because OSA has joined type 2 diabetes as a condition largely stemming from the national epidemic of obesity.

Visualization is courtesy of

Many people think that sleep apnea is snoring, but although it’s frequently associated with snoring (commonly a wife will bring her husband to the doctor with complaints about being kept awake), apnea is a different condition. OSA occurs when a person’s pharynx or windpipe, the upper airway in the throat, collapses during sleep and breathing stops for at least 10 seconds; a single stoppage may last up to a minute. This may happen frequently, even hundreds of times a night. The person may be totally unaware; sometimes someone else in bed notices that breathing has stopped and becomes alarmed. Sleep apnea can cause more than drowsiness the next day: it’s associated with cardiovascular disease, cognitive problems, mood disorders, and more.

Although it tends to slip by undiagnosed, OSA is very common. Estimates are that in Western countries roughly 1 out of every 5 adults has at least mild OSA, while 1 in every 15 has at least moderate OSA. Numerically, this amounts to about 18 million Americans who are thought to have the disorder.

Your greatest risk factor is overweight. Because OSA is strongly linked with obesity, rates are climbing. It’s thought that as many as 40% of obese people have sleep apnea, and about 70% of people with OSA are obese. There are very few studies on the prevalence of OSA in obese children, but they seem to have four to five times the risk of sleep apnea as non-obese children.

All sleep disorders would be easier to understand if sleep itself were understood. Yet nobody knows for sure why we need to sleep at all. The prominent sleep scientist William Dement conducted his research for fifty years and concluded, in effect, that the reason people need to sleep is that they grow sleepy. We do know, however, a good deal about the damage done by sleep deprivation. Animals that are completely deprived of sleep lose immune function and die in a matter of weeks. Losing as little as one night’s sleep causes us to become drowsy and unable to concentrate the next day. Physical performance, including hand-eye coordination and reaction time, becomes impaired, along with judgment, memory, and ability to do math. Continued lack of sleep leads to mood swings and hallucinations. It has also been found that there are long-term deficits to “getting by” on less than 8 to 9 hours of sleep a night. Despite the fact that you may think you’ve adapted to shorter sleep, your body knows the difference.

How does air flow get blocked?

The pharynx is located behind the tongue and soft palate. This upper portion of the airway from the lungs has little support from bones or cartilage and mostly relies on muscles to keep it open. Normally, the muscles surrounding the airway remain constricted enough to keep the airway taut. But in sleep apnea the throat relaxes, allowing the windpipe to collapse. In adults, OSA frequently occurs due to the buildup of fat or the general loss of muscle tone that accompanies aging. In children OSA is often caused by enlarged tonsils and adenoids.

When breathing is cut off in a sleep apnea episode, the blood vessels constrict and the level of blood oxygen falls. The low oxygen level signals the brain to wake up just enough to cause the throat muscles to tighten, which stiffens and opens up the windpipe, allowing air to rush in. Snoring may occur as the person inhales, but the snoring itself is not dangerous: it’s a sign that air is getting in. Other audible signs are snorting or gasping. This cycle of the throat relaxing and tightening may be repeated many times a night.

Risk factors
OSA can develop in people of any age, gender, or weight, but the main risk factors for the disorder are:

• Obesity
• Middle age (ages 40-60)
• Male gender

Other risk factors include:

• Neck circumference of 17” or more (for men) or 16” or more (for women)
• Enlarged tonsils or adenoids
• Smoking
• Use of alcohol, sedatives, or tranquilizers

Testing and diagnosis
If you suspect you have OSA because someone has noticed loud snoring, gasping, or pauses in your breathing at night or because you have daytime symptoms (like drowsiness, headache, and fatigue), then see your doctor. If it seems likely you have OSA, he or she may suggest you have diagnostic polysomnography. Your breathing, heart rate, brain activity, blood pressure, and other functions will be monitored overnight while you sleep. You may be diagnosed as having mild, moderate, or severe sleep apnea.

OSA and obesity
The close association with obesity is due to a number of factors. When someone is obese, fat cells infiltrate neck and throat tissues so that they lose tone and are more likely to collapse. The neck and chin become enlarged and press on the throat when the person is lying down. Excess fat compresses the chest and makes it difficult to inhale deeply. Finally, too much visceral fat (internal abdominal fat) pushes up on the diaphragm, the sheet of muscular tissue between the abdomen and the chest. This, too, prevents deep inhalation.

It appears that not only can obesity cause OSA, OSA can also lead to or worsen obesity. Sleep apnea causes imbalances in the levels of two hormones that are associated with feelings of hunger and satiety: leptin and ghrelin. Leptin produces feelings of satiety, and ghrelin has the reverse function: it’s an appetite stimulant. Disrupted sleep causes levels of ghrelin to rise, levels of leptin to decrease.

But OSA can occur in people who aren’t overweight, too. For them, the disorder may be due to chronic nasal congestion or having very large tonsils, an oversized uvula, or a small, receding jaw. Untreated OSA can have deadly consequences. The afflicted have three times the risk of dying from any cause compared with people who don’t have the disorder. One of the more likely causes of death is cardiovascular disease.

Why are cardiovascular disease and OSA linked?
High blood pressure is very likely a culprit. Some 50-60% of people with OSA have hypertension, and about 30% of those with hypertension are estimated to have OSA, often undiagnosed. Hypertension in someone with OSA may be due to activation of the sympathetic nervous system, which responds to the “threat” of low oxygen levels. Normal blood oxygen saturation values are 97-99%, but people with OSA may have oxygen saturation levels of 60% or even lower. The sympathetic nervous system reacts to these low levels (and possibly to other factors, such as disrupted levels of the hormone leptin) by severely constricting blood vessels and increasing heart rate. Surges in blood pressure as high as 250/110 mm Hg can occur as blood is forced into severely constricted blood vessels during an episode of sleep apnea.

Worse still, this sympathetic activation continues during the day, continuing to constrict blood vessels and increase heart rate. Hypertension, in turn, can lead to hardening of the arteries, or atherosclerosis, and all the problems that can come from it: heart attack and stroke, pulmonary vascular disease, congestive heart failure, and heart arrhythmias.

Other problems can stem from OSA, such as

• Drowsiness and fatigue
• Headaches
• Falling asleep unexpectedly during the day
• Memory problems as well as difficulty concentrating
• Social life and sexuality may suffer due to fatigue and, in men, erectile dysfunction
• Physical health may be impaired because the person is too tired to exercise
• Depression

Sleep apnea damages the brain
MRI studies of people with sleep apnea have found that the concentration of the brain’s gray matter—the cerebral cortex of the brain, where most information processing takes place—is actually reduced in people with sleep apnea. Affected were areas involved in memory, concentration, cardiovascular activity, breathing, and executive functioning.

Raised glucose levels
OSA can raise insulin and glucose (blood sugar) levels and impair the body’s ability to process glucose. People with moderate-to-severe sleep apnea may have twice the risk of developing insulin resistance, leading to diabetes.

Treating sleep apnea

Sometimes lifestyle modifications can be all that is necessary to cure sleep apnea:

• Weight loss. Even a small amount of weight loss can help relieve sleep apnea, and a large amount of weight loss often cures the condition completely.

• Sleeping on your side or stomach. Sleeping on your back permits the tongue and soft palate to rest on the back of your throat and block the airway. Try sewing one or more tennis balls in the back of your pajamas to keep yourself from sleeping on your back. This simple technique can be surprisingly effective!

• Avoid alcohol, tranquilizers, and sleeping pills. They can relax the muscles in the back of your throat so that it collapses during sleep.

• Keep nasal passages open. Try using a saline nasal spray or a neti pot (a small pot used to pour water into the nostrils) to keep your nasal passages clear.

Continuous positive air pressure (CPAP) is the most common treatment for sleep apnea, and it’s usually very effective for moderate-to-severe sleep apnea. CPAP machines blow air out into the nose and possibly the mouth as well, depending on the interface. The gentle pressure of the air pushes your throat open so that it can’t collapse while you sleep, thus preventing sleep apneas.

Tips for a good night’s sleep

• Establish a relaxing bedtime routine that you follow every night, at about the same time. Over time, your brain and body start to get the message that these activities mean it’s time to relax and go to sleep. You might want to take a hot bath, sip herb tea or warm cocoa, read a good book, or do some stretches or gentle yoga. You should avoid doing anything that stimulates or upsets you, like watching a violent movie.

• Snack lightly before bedtime on foods containing tryptophan, such as dairy products, chicken, turkey, and almonds.

• Eat lightly at dinner and don’t eat foods that may cause indigestion. Eat several hours before you go to bed.

• Avoid imbibing caffeine in the afternoon or evening.

• Take short naps or none at all.

• Exercise during the day, but avoid exercising at night.

• Establish your body’s sleep-wake cycle by going to bed and getting up at about the same times each day.

• Don’t smoke: nicotine is a stimulant.

The amount of air flow delivered by the CPAP machine is individualized. To determine the best adjustment, it’s necessary to sleep overnight in the sleep lab wearing the CPAP mask while the sleep technician monitors your sleep.

Oral appliances, or dental devices, are generally less effective than CPAP, but some people find them easier to use. They are usually plastic devices that are designed to prevent soft tissues from collapsing and pressing on the airway. There are many different kinds, and it’s necessary to go to a dentist to have one custom-fitted for individual needs.

Top comments

  • HI a good suggestion to help promote the articals is to have a share button. I wanted to share this with my dad and am having to paste the link in an email. Keep up the good work, DEan

    Dean Richards // 2012-01-04 23:32:33 // //
  • The CPAP is a gold standard for severe sleep apnea, but as a dentist, I can tell you we`ve had great success with oral appliances for mild to moderate sleep apnea. Of all CPAP users, 50% are non-compliant, which is not the case with oral appliances.

    Dr. Dan Sindelar // 2012-01-05 09:45:02 // //



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  • Dr. Gominak! Her research is all over this. She`s a neurologist and is helping people with their sleep issues; and its actually helping other issues like diabetes and heart conditions too. The body repairs itself during sleep. The body grows during sleep. Problems arise when we cant sleep. A sleep test can show what is going on at night. Really, obese people have this problem? No sleep affects hormones that affect weight. Please research this. I agree with lisacalisa. You Mr Chopra, can find the rest of this puzzle. And thank you lisacalisa for pointing me to Dr. Gominak.

    Jones // 2013-12-20 13:58:31 // //
  • sleep devices

    Sleeper // 2013-05-30 15:39:27 // //
  • Thank you for sharing this information. Sleep apnea is a terrible condition that many face, so being educated is the first step in terms of prevention. Luckily today, we have the luxory of sleep devices and posts like this helping us in the fight against sleep apnea.

    Jimmy Keillor // 2013-05-30 15:38:11 // //
  • Most of the non-compliant CPAP users are frustrated with air leakage problems, pressure marks on the face and irritation or sores on their noses and faces. We have found that using the Remzzzs Mask Liners will eliminate most of these issues making compliance rates significantly higher.

    Rivka Meyer // 2013-02-20 15:20:19 // //
  • Dr Chopra, It is slowly starting to become realized within the medical field and the public that it is not obesity that causes sleep apnea but sleep apnea that causes obesity. I have had it since I was very young and very thin. Sleeping actually helps you loose weight. But that`s not what I really want to say or talk about. I am wondering if you being an expert in the field of neuroendocrinology studied the effects of vitamin d on sleep? There is an interesting study by Dr Gominak concerning the topic. Here is her web address She is a neurologist and she stumbled across some interesting data that shows everyone with a sleep disorder of some kind (84 different types, I believe,) has a vitamin d deficiency. This is your area of expertise and I would be interested in hearing your thoughts on the subject. In fact, I am waiting for you to look at the study so you can put the pieces together to find the cure. I know that it is you who will cure sleep apnea and other sleep disorders and I know that soon you will be working closely with someone I know that holds another piece of the puzzle. I am so excited and have been waiting a very long time for a cure as have others.

    Lisacalisa // 2013-01-09 19:06:48 // //
  • Confirmo mi gusto por el sueño!!

    Geraldine García // 2012-08-01 12:01:42 // //
  • thank you so much for this invaluable information!

    Sharie Korter // 2012-08-01 01:34:28 // //
  • Mahalo Deepak

    Starshine Giese // 2012-08-01 00:15:03 // //
  • Thank u very much! <3

    Andrea Kg // 2012-07-31 23:56:23 // //
  • I enjoy and learn every time I listen to Deepak and/or the Chopra well<3

    Stephanie House // 2012-07-31 23:36:06 // //
  • Good info to know! TY for sharing

    Patti Hite // 2012-07-31 23:29:43 // //
  • As a sleep Technologist in the Pacific Northwest, I am happy to see this information getting out to so many people from such a highly respected individual.

    Lynda Treadway // 2012-07-31 23:24:20 // //
  • Is that the same as wet dreams?

    Juliano Bodega // 2012-07-31 23:22:06 // //
  • FYI Shanise Leilani & Hassina Serenity :o)

    Samuel J. Martin III // 2012-07-31 23:18:41 // //
  • For those of us who are thin with sleep apnea we are a bit tired of being told in most advice that all most people need to do is to lose weight. I am unable to sleep on my side due to a neuro condition... And cant have the pressure of cpap on my face due to same condition or my face will go numb..i worry that i will develop alzheimer`s as a result of apnea. Is that a valid fear?

    Eleanor // 2012-01-21 04:56:06 // //
  • Simply by reducing my carbohydrate intake and losing weight I am completely cured of OSA. The girls at the sleep clinic couldn`t believe it. Like drugs, CPAP simply masks the underling cause which is high carbohydrate intake and being overweight.

    Jason // 2012-01-10 02:16:06 // //
  • I suffer with sleep apnea. I have issue with the cpap mask. I`ve tried quite a few - something about it makes me feel claustrophobic. I also tried an oral appliance, cost me $500, but it broke in about 4 months. Sadly, due to a lack of insurance I`ve been going without care. I feel terrible.

    queenroz64 // 2012-01-10 01:14:44 // //
  • Thank you for the comprehensive lists! This is very useful for me.

    Bob // 2012-01-10 00:33:27 // //
  • I’ve long suspected I’m experiencing oxygen deprivation sometimes while sleeping. The symptoms of OSA fit me quite well, especially when I’ve missed a night or so of sleep and am “catching up.” None of the predisposing factors fit me except for age and the remote possibility of a narrowed throat due to reshaping of my cervical spine. Still, it’s a very helpful article in terms of considering the oxygen deprivation factor and also for the general advice for getting better sleep. I especially like the herb tea & almonds idea. Great article. Thanks.

    Rmarie // 2012-01-06 11:47:14 // //
  • The CPAP is a gold standard for severe sleep apnea, but as a dentist, I can tell you we`ve had great success with oral appliances for mild to moderate sleep apnea. Of all CPAP users, 50% are non-compliant, which is not the case with oral appliances.

    Dr. Dan Sindelar // 2012-01-05 09:45:02 // //
  • A yogi doesn`t need much sleep. Our inner awareness can give us a lot energy than we can imagine!

    Chandresh Bhardwaj // 2012-01-05 09:26:49 // //
  • Excercisiong in the evening keeps me up longer, but when I fall asleep, I sleep like a ton of brick. Anxiety keeps me awake at all times and excercise, meditation calms my mind. Great article!

    Shary Udall // 2012-01-05 09:19:06 // //
  • HI a good suggestion to help promote the articals is to have a share button. I wanted to share this with my dad and am having to paste the link in an email. Keep up the good work, DEan

    Dean Richards // 2012-01-04 23:32:33 // //
  • The WAR: Susskind-Hawking battle, where Leonard Susskind and Gerard `t Hooft publicly `declared war` on Hawking`s solution! DO YOU AGREE WITH WHAT THEY SAY? Do you agree with Susskind?

    Adrian Ferent // 2012-01-04 22:00:09 // //
  • I love these health videos! I am a Registered Nurse and have a health Page NURSESUZE I have been sending several people to your site for further info from your videos. : )

    The Journey // 2012-01-04 21:01:54 // //